Need to download: pcasvc.dll

Dear Mtnman33!

Welcome to the Microsoft Community!

The problem you encountered may be caused by some accidental loss of your dll file.

For the runtime file PcaSvc.dll, it seems that only a scheduled task in Windows will call it, but for individual users, deleting this task will not affect it, and it should be possible to remove your abnormal pop-up reminder.

Solution 1:

Search for "Task Scheduler" in the search box next to the Start menu and open it. In the left folder of "Task Scheduler", click "Task Scheduler Library" to expand the subfolder.

Open the corresponding folders in the following order: Microsoft -> Windows -> Application Experience.

After clicking the "Application Experience" node, find the task named "PcaWallpaperAppDetect" in the list view on the right.

Right-click the task, select "Delete" in the pop-up menu, and click "Yes" in the confirmation dialog box to delete the task. The PcaSvc.dll error missing entry warning is resolved.

Solution 2:

Use the DISM/SFC system repair tool to repair the system, which may restore the dll file lost due to abnormality.

Search "CMD" in the search box on the taskbar, and choose to run the command prompt as an administrator:

Dism /Online /Cleanup-Image /ScanHealth 

This command will scan all system files and compare them with the official system files to scan for inconsistencies in the computer.

Dism /Online /Cleanup-Image /CheckHealth 

This command must be used after the previous command is executed and the system files are found to be damaged.

DISM /Online /Cleanup-image /RestoreHealth 

This command restores those different system files to the official system source files.

Whether the first three commands are available or not, restart after completion, and then type the following command:

sfc /SCANNOW 

Solution 3:

Use command line statements to reregister all runtime files to solve the problem of missing runtime files:

Reregister all DLL files:

You can run the following command in a command prompt with administrator privileges:

for %1 in (%windir%\System32\*.dll) do regsvr32.exe /s %1

This will reregister all DLL files in the System32 directory.

Final solution:

Because the runtime files in Windows are universal, you can find another computer with the same system/version (or close to it), navigate to the C:\WINDOWS\system32 directory, copy its PcaSvc.dll file and copy it to the directory of the problem computer to replace it. (Please make sure to back up and restore points for the normal working computer to prevent accidental deletion.)

But the known problem is that this problem has been completely solved in Windows 11, Win11 24H2 26100.712, and the problem can be solved by directly updating the system. After all, on June 3, Microsoft's development team had already noticed the "PcaSvc.dll" missing error, and according to its development log, the problem has been solved.

I hope above information can help you. If you have any questions, please feel free to let me know. Tell me the results. I'm looking forward to hearing from you.

Thank you for your understanding and support! 

I wish you all the best.

Best regards,

Yang.Z - MSFT | Microsoft Community Support Specialist