When I try to run "error-checking" in normal or safe mode, I get the usual
"The disk check could not be performed because exclusive access to the drive could not be obtained.....schedule this disk check to occur the next time you restart the computer?"

To which I say "yes" and restart. The scan starts before you get the login prompt and does it's thing like it should until stage 4 (of 5?) at 7% then just sits there indefinatly.
I have to cold boot then skip the test to get back into windows, but I need to fix these bad sectors.