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Let’s see how to fix RunDll errors on startup in Windows 11/10. I recommend you create a System Restore Point first. Reinstall the affected program Repair your Windows system files Run Chkdsk scan ...
If you receive a Missing Entry: PCAWallpaperAppDetect RunDLL error popup in Windows 11, open the Task Scheduler and delete the PcaWallpaperAppDetect Scheduled Task.
Check if RunDLL error at startup still occurs. After following the solutions mentioned, you will successfully fix RunDLL error at Startup on Windows 10.