What happens when you try to boot into Safe Mode? As soon as you start your computer, keep pressing F8, until you get image like this:
Are you getting this?
Are you getting this?
chkdsk C: /r
sfc /scannow
findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfcdetails.txt"
What is the current account you are logged on? Is it fully functional?
Can you create a new account and see if it is going to work? I don't think you will be able to access the other account.