Yoy may have something corrupt is the configuration folder.
Since this is a new install.
1) Uninstall Calibre
2) delete the configuration folder (red) it usually is here (it may be hidden):
C:\Users\<logon name>\AppData\Roaming\calibre
Then reinstall Calibre.
BTW don't put the Library on a Cloud drive (backing up to the cloud, NOT Google drive) is OK when calibre is NOT running)
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