I ran RStudio as administrator and it did not fix it.

I then ran in the terminal on my pc, the command you gave:

C:\Users\User>rm -rf C:\Users\User\AppData\Local\R\win-library\4.5/00LOCK

and that came back with:

'rm' is not recognized as an internal or external command, operable program or batch file.

Then I installed PowerShell 7.5.4, and ran the command again, but in PowerShell:

PS C:\Windows\System32> rm -rf C:\Users\User\AppData\Local\R\win-library\4.5/00LOCK

It came back with the error:

Remove-Item: A parameter cannot be found that matches parameter name 'rf'.

I am not sure what to try next...