Please do not change permissions on the C drive, that will cause huge problems with Windows and you would need to re-install Windows.
With the number of problems you are experiencing the best option is to perform an in-place repair with the Windows 11 ISO.
Please follow the steps, this is then just an update and your personal files, settings and installed software will not be affected.
Click this link:
https://www.microsoft.com/en-us/software-downlo...
to download the Windows 11 ISOWhen the ISO file completes downloading
Disconnect from the Internet
Disconnect all external devices with the exception of a mouse or keyboard.
Temporarily disable any 3rd party Anti-virus you may have installed
Then, in Windows File Explorer, double click the ISO and then run Setup.exe and select the upgrade option.
Thanks for this, so it's not a fresh install per se it's just a repair? I've thought about doing a fresh install tbh as that might get rid of the ASUS and McAfee Bloatware that's installed. Would you say the ISO is the better route for now? Can I remove the McAfee and ASUS software as well, or will this cause issues? In the past when I was a windows user I always found software like this slowed the system down after a while.