You can try the .reg for SCardSvr from : How to Restore Default Services in Windows 10
ABOUT SMART CARD SERVICE (SCardSvr)
The smart card service (SCardSvr) in the services section on my computer was somehow deleted or I accidentally deleted it.
How can I restore the smart card service (SCardSvr)?
Windows for business | Windows Client for IT Pros | User experience | Other
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Limitless Technology 39,931 Reputation points
2022-06-24T11:24:56.027+00:00 Hi there,
I would suggest you to restore the PC to the date before you made this .
-Enter Control Panel in the search box, and tap or click Control Panel.
-Enter Recovery in the Control Panel search box, and then tap or click Recovery.
-Tap or click Open System Restore, and then follow the instructions.If you wish to create the service then you can use the Windows NT Resource Kit. The Windows NT Resource Kit provides two utilities that allow you to create a Windows NT user-defined service for Windows NT applications and some 16-bit applications, but not for batch files.
Create a user-defined service https://learn.microsoft.com/en-us/troubleshoot/windows-client/deployment/create-user-defined-service
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