So I posted this issue here before and it was resolved, thread can be found here http://community.norton.com/t5/Norton-360/Norton-can-t-run-quick-scan/td-p/1082945
But today I discovered that I have the same problem again, unable to run quick scans (haven't tried full scans because I've had trouble in the past where when I click cancel it stays as "cancelling" for a long time and doesnt go away, on top of that I don't want to run a full scan).
I've tried using the solution in my previous thread, namely the sfc /scannow thing. But this time it didn't detect any integrity violations so it didn't fix anything.
What should I do now?