I was trying to run sfc /scannow, which gave me:
I figured through google that it's the problem of the Windows Modules Installer,Code:Windows Resource Protection could not start the repair service.
and the problem seemed to be the default setting of its startup type;
however, when I went into services.msc, Windows Modules Installer did not even exist.
I then went to c:\windows\servicing in order to check whether TrustedInstaller.exe existed, which it did, so I tried running it, but nothing happened.