I've got a friend's laptop in my possession which has been having random lockups and just general problems lately. Found out that his hard drive had a fair amount of bad sectors, and that was affecting things. Ran chkdsk, and that fixed up a bunch of stuff.
Unfortunately as a result, some OS files seem to have gotten corrupted in the process of fixing up those bad sectors. I've been trying to coax the laptop to run "sfc /scannow", but unfortunately I'm met with the following problems:
1) I cannot for the life of me open a Command Prompt with Administrative privileges. Start Menu is unresponsive, Windows-R gives me a run window, but the "type in cmd, then ctrl-shift-enter" approach to run an elevated command prompt doesn't seem to be working
2) "sfc" can't be run from Windows Recovery, as the service has to be running
3) Safe mode does not boot. At all.
Any other ideas other than nuking the OS from orbit and re-installing?