yesterday (3/19/2026 ) spouse told me he watched youtube how to verify computer whether got problems by [run (administrator) cmd typed perfmon /report] so i did and Diagnostic Results found Warnings: memory BUSY and Basic System Checks [The Security Center reports that User Access Control is disabled], same as spouse.

searched : how to solve [User Access Control is disabled.] in perfmon /report ?] To solve the "User Access Control is disabled" error in perfmon /report, you must re-enable User Account Control (UAC) via the registry or control panel, ensuring EnableLUA is set to 1. Alternatively, run Perfmon as an administrator, add your account to the "Performance Log Users" group, or rebuild counters using lodctr /r.
Here are the specific solutions:
1. Enable UAC (Fix "User Access Control is disabled")
If UAC is disabled, Perfmon cannot collect system diagnostics.
Via Control Panel: Type "UAC" in the Windows search bar, select Change User Account Control settings, and move the slider to the default (or higher) position.
Via Registry (if locked): Open regedit and navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
Locate EnableLUA and set its value to 1. Restart your computer.

To solve the "User Access Control is disabled" error in perfmon /report, you must re-enable User Account Control (UAC) via the registry or control panel, ensuring EnableLUA is set to 1. Alternatively, run Perfmon as an administrator, add your account to the "Performance Log Users" group, or rebuild counters using lodctr /r.
Here are the specific solutions:
1. Enable UAC (Fix "User Access Control is disabled")
If UAC is disabled, Perfmon cannot collect system diagnostics.
Via Control Panel: Type "UAC" in the Windows search bar, select Change User Account Control settings, and move the slider to the default (or higher) position. -- bottom [never notify] changed to middle [default] on 03/19/2026
ie notify me only when apps try to make changes to my computer
Via Registry (if locked): Open regedit and navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System Locate EnableLUA and set its value to 1. Restart your computer.
-- i did [0] changed to [1] on 3/20/20262.

Run Perfmon as Administrator
If UAC is enabled but you still get the error, open the Command Prompt or PowerShell as an Administrator, then run perfmon /report.
(Administrator) C:\Users\user-name >perfmon /report
............................. Not apply to Home Edition SKIP it 3. Add User to Performance Groups
If running as a standard user, you must be added to the necessary performance groups:
Open compmgmt.msc (Computer Management).
Go to System Tools > Local Users and Groups > Groups.
Double-click Performance Log Users and add your account.
Also add your account to Performance Monitor Users.
compmgmt.msc cant find [ Local Users and Groups]
Windows Home Edition, which does not include this feature
.............................
4. Rebuild Performance Counters PS not my case
If counters are corrupted, the report will fail:
Open Command Prompt as Administrator.
Type cd\windows\system32 and press Enter.
Type lodctr /r and press Enter to rebuild the counters
5. Check Service Status
Ensure the necessary services are running:
Open services.msc.
Verify Performance Logs & Alerts and Diagnostic Policy Service are set to "Automatic" and are currently running --i did [manual] changed to [automatic] on 03/19/2026

then restart PC , memory from [busy 77% 1868 MB Available] down to normal [65% 2801MB available] And Basic System Checks all passed.

PS 3/20/2026 before restart PC i made copypaste (as .txt file) of the result and click file (save .html file and print to .pdf file)to downloads, if needs can compare the difference.
-------------------------
3/20/2026 when i tried to finish [国博闹乌龙：牛骨上刻着两个西周的大事卦，放反了！]--feedback unfinished job so searched my HD 天雷无妄 511 681.txt then cant find the file folder with others. i felt not again. so use windows/system32/notepad.exe found those auto disappeared data file folder and open the file that became unreadable as conflict with windows notepad.exe UTF-8.
so searched [which windows file explorer notepad.exe has utf-8 caused system32 > notepad.exe conflict became unreadable?] The UTF-8 conflict causing unreadable text in Notepad (system32) often occurs when files saved as UTF-8 (without BOM) are misread as ANSI or UTF-16 LE, particularly on
Windows 10/11 when handling command-line output redirection or foreign character sets. This happens because Notepad sometimes misidentifies the encoding, creating "garbled" text.
Key Details of the Conflict:
The Issue: UTF-8 files without a Byte Order Mark (BOM) are frequently misread by older Notepad versions as ANSI or UTF-16, resulting in strange symbols.
System32 vs. UWP: The classic C:\Windows\System32\notepad.exe has historically struggled with encoding autodetection compared to modern text editors.
Context: This is often seen when files created in other applications, or via command-line redirection (>), are opened.
Solutions:
Save as UTF-8 with BOM: Open the file in Notepad, choose "Save as," and explicitly select "UTF-8" in the encoding dropdown to add the BOM.
Use UTF-8 in Notepad++: A user on the Notepad++ community forums suggested checking file associations, as Notepad++ handles UTF-8 more reliably.
Repair Notepad: Run a repair through Windows Settings > Apps > Optional features if the application itself is corrupted.
This issue is common when transferring files between older and newer Windows systems, as default encoding behaviors have changed.
--UTF-8 (without BOM) 1st time ame to my eyes immediately to verify in opened xxx.txt that i did see by click file , save as and on the bottom Encoding UTF-8 click which showed: ANSI , UTF-16LE , UTF-16BE , UTF-8 , and UTF-8 with BOM.
obviously after i retart PC windows notepad.exe auto updated to new version (i would say my suggest UTF-8 new to avoid conflict with windows system32 notepad.exe)
then during wrote in here suddenly those auto disappeared file folders all popped up and they are readable.
so i didnt save as UTF-8 with BOM becaue that means lot data files need to do it.

searched : do i have to change all data files (UTF-8) into [UTF-8 with BOM] ?
No, you generally do not have to change all your UTF-8 data files into UTF-8 with BOM.
In fact, the Unicode Standard permits the BOM (Byte Order Mark) in UTF-8, but does not recommend its use. UTF-8 does not have byte order (endianness) issues, so a BOM is not needed for that purpose.
Here is a breakdown of when to use which format:
When to use UTF-8 without BOM (Recommended)
Most Scenarios: This is the preferred format for modern software, Linux/Unix systems, web content (HTML/CSS), and code files.
Version Control: BOMs can cause issues with Git, diffing tools, and concatenating files.
Programming: Scripts (like Bash, Python, or PHP) often fail if a BOM is present, as it interferes with the "shebang" (#!) line or causes character issues.
When you might need UTF-8 with BOM
Legacy Windows Applications: Older Microsoft applications (e.g., Notepad, older Visual Studio) sometimes require a BOM to recognize the file as UTF-8 rather than ANSI.
Excel CSVs: Microsoft Excel often requires a BOM to correctly open CSV files containing special characters (non-ASCII) in UTF-8. Without it, Excel might display garbled text.
Specific Windows Tooling: Some specific configuration files or tools (e.g., older PowerShell) require a BOM signature.
--i have no idea what it talked about that all my data files i use [UTF-8] and never saw
[UTF-8 with BOM] as by [click file select save as] the encoding default is UTF-8.

Summary Recommendation
If your files are working fine, do not change them.
If you are creating files for modern applications, avoid the BOM.
If (and only if) you are creating files that will be opened exclusively in Microsoft Excel or old Windows apps and you see "garbled text" or "gibberish," then consider using UTF-8 with BOM.
--it happened before that many Excel file cant open at all. thought MS force users to buy MS360 Excel no more free so i gave up and wrote in notepad in stead. still cant figure out notepad allow open Excel file?
searched [utf-8 with BOM can open Excel data file ?] Yes, adding a UTF-8 BOM (Byte Order Mark) (EF, BB, BF) to the beginning of a CSV file is a reliable way to make Microsoft Excel (2007 and later) automatically recognize and display UTF-8 encoded text correctly. It solves formatting issues with special characters (e.g., accents, non-Latin scripts) that occur with standard UTF-8.
Key Details About UTF-8 BOM and Excel:
Automatic Recognition: The BOM acts as a signature that tells Excel, "this file is UTF-8," preventing it from defaulting to ANSI, as explained on Stack Overflow.
Best Practice: While not required by the general UTF-8 standard, it is widely used to force Excel compatibility, according to discussions on Software Engineering Stack Exchange.
Alternative (No BOM): If you cannot add a BOM, use the Data > Get Data > From File > From Text/CSV wizard to specify the encoding.
Potential Issues:
Some older versions of Excel may still ignore the BOM, as noted on Stack Overflow.
Using a BOM can sometimes cause issues with non-Excel applications that do not expect the special character at the start of the file, say Stack Overflow users.
--maybe in the future if not busy like old dog would try the solution. since long time gave up already lost passion in any MS free app but 100% plain notepad.exe if MS allows.

ps also searched [after fixed pfmon/report UAC problem and restart pc the file explorer became old version and lost many data file folders again ?] Based on your description, it appears you are logged into a temporary user profile after a system instability event, likely triggered during the UAC (User Account Control) fix or the subsequent restart. The "old" File Explorer look and missing folders are classic signs that Windows could not load your user profile correctly and instead loaded a blank, temporary one.
Do not save any new files to the desktop or move files around in this state, as they may be deleted upon the next restart.
Here are the steps to recover your data:
1. Immediate Action: Restart Your PC
Often, a temporary profile is a temporary glitch. Restart your computer two or three times in a row. This can allow Windows to properly load your original user profile.
--the problem is didnt know until searched the certain file folder file, isnt too late already?

2. Verify Your Actual Files
If restarting does not work, check if your files still exist elsewhere:
Open File Explorer.
Navigate to C:\Users.
Look for your original username folder. If it exists, open it and check your Desktop, Documents, and Downloads folders to see if your files are there.
--my case experiences windows , system32 , notepad.exe sometimes can find the missing file folders.

3. Move Data to a Safe Location
If you find your files in C:\Users\[YourOriginalUsername], immediately copy them to an external drive, USB stick, or a safe, non-system partition (like a D: drive if you have one).
--highly suspect due to very bad experiences that HD file explorer seemed auto sync with usb even is not system partition. it is a diaster destroyed all backup data files in usb devices. really hate auto sync , onedrive and any new feature added since in 2024.

4. Rebuild the User Profile
If the profile remains temporary, you may need to create a new user profile:
Create a new Administrator account: Go to Settings > Accounts > Family & other users > Add someone else to this PC. Make sure this account is set to "Administrator".
Move files: Log in to the new account and copy the files from your old C:\Users\[OldUsername] folder to the new one.
--does it really help or too complex create more bugs ? i felt in usa better the simplest architecture the best. the more link the worse. it must exist some rule to auto switch user different versions without user knowing or permission. that is why frequently after restart pc even without restart it happens as i kept pointed out file explorer auto swiched to different versions daily over 3 times. i thought my pc is under malicious hacker controlling.

Delete the corrupted profile: After verifying, you can delete the old account in netplwiz.
5. Fix "Old Version" File Explorer
If you are on Windows 11 and File Explorer looks like Windows 10, try these fixes:
Run System Repairs: Open Command Prompt as Administrator and run sfc /scannow followed by DISM /Online /Cleanup-Image /RestoreHealth.
Check "Separate Process" Setting: Open File Explorer, go to the three-dot menu (...) > Options > View. Under Advanced Settings, uncheck "Launch folder windows in a separate process".
6. Alternative: Use System Restore
If the problem started after fixing the UAC issue, you can use System Restore to revert your computer to the state it was in before that change:
Type "Create a restore point" into the Windows search bar.
Click System Restore and choose a date before the UAC issues started.
Disclaimer: If files are completely missing, use tools like Windows File Recovery (winfr) to recover them
--i didnt follow the susggestion (restart pc..) as didnt know it happened again until hours later tried to open the specific file. if any bad side effect happened that is the fate as MS user which no warnning nor received notification even already changed UAC to default.

ps searched [why after MS and related 3rd party app updated caused certain file folders auto disappeared?] After Microsoft (MS) or 3rd-party updates, folders may appear to disappear due to temporary user profile login, OneDrive synchronization conflicts, or Windows moving files into a
Windows.old folder, rather than actual deletion. The system sometimes fails to load user data, creating a clean temporary profile instead.
Common Causes for Missing Files/Folders Post-Update:

Temporary Profile: The update did not load your user account properly, making your Desktop and Documents appear empty.
OneDrive Sync Issues: OneDrive may have taken over folder locations (like Desktop), resulting in files moving to the Cloud rather than staying local.
Windows.old Folder: If the upgrade was major, your old files may have been moved to C:\Windows.old.
Security Software Conflict: Third-party anti-virus/cleanup apps might mistake changes from updates as threats and move files into quarantine.
DLL Misplacement: 3rd party apps may have files or DLLs misplaced in SYSWOW64 during updates.
How to Fix and Recover Your Files:
Restart the PC: Restart your PC 3–4 times, allowing the computer to reach the desktop each time; this frequently fixes the temporary profile bug.
Check C:\Users\: Look in the C:\Users\[Username] directory to check if your files exist in a different profile folder.
Check Windows.old: Check C:\Windows.old to locate your old user folders.
Check OneDrive: Check OneDrive settings or the OneDrive recycling bin to see if files were moved to the cloud.
Restart 3rd Party Apps: Close related apps (e.g., File Manager, Office apps) and restart them.
Important: Do not save new data to a "temporary" desktop, as it will be erased upon logging out