Hi ,
If that doesn't work, try following Ramesh's procedure to unlink your college account and any other related accounts from a personal laptop.
Then follow the procedure in the link below to reset the security policies: https://woshub.com/reset-local-group-policies-settings-in-windows/, under the "Reset Local Security Policy Settings to Default in Windows" option.
Restart the PC and follow the steps.
Open the command prompt (admin) and run the commands: sfc /scannow and dism /online /cleanup-image /restorehealth. Wait for the process to finish and restart the computer.
Then perform a clean boot and, if you want, uninstall applications that you don't use.
Try updating using the update service or via ISO.
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Thanks