Hi, YeaAn
Welcome to Microsoft Community.
We understand that you are experiencing Windows Update Stuck and PcaSvc.dll Error Reporting issues.
The reasons for these two issues are different, as your inability to update may be related to an error in your update cache and not connecting to the update server, while the dll error may be related to a corrupted system component.Considering the number of complicated steps that may be required to solve your problem individually, it is recommended that you repair your system directly through Media Creation Tool, which will update your system and repair the system components directly. This is not a reinstallation, it will repair your system and will not delete files or applications. However, if you have important data on your computer, we still recommend backing it up in advance.Once you have completed your backup, follow the steps in the guide below:Download Media Creation Tool by visiting the site below and clicking on “Download Tool Now” (not “Update Now”).-Download Windows 11 (microsoft.com) Run the MCT tool, create an ISO image and run it!When the ISO file has finished downloading, double-click it to open it and run setup.exe.-Select “Not Now” on the “Get Updates, Drivers, and Options” page.-Next Confirm your files, applications. Settings are preserved. It will also show you the version of Windows it will install.If you are asked to enter a key, the ISO you downloaded does not match your current system version.-On the Select what to keep screen, select Keep files and applications.Click Install to begin the non-destructive repair.Disclaimer: Let’s try performing an in-place install or in-place upgrade which will refresh your Windows files and operating system without removing files or applications. That being said, we always recommend that if you have important data, you should back it up before making large system changes. If you want to back up your data first, please do so. Once you are done backing up, you can follow the steps in the following guides:How to run In-place upgrade in Windows 11 - Microsoft CommunityIf you have any progress, please feel free to contact us.
Best Regards
Nicholas.Z - MSFT | Microsoft Community Support Specialist