I tried it and it actually worked!!
The computer did not get a bsod on start up and itinstead it ran a chkdks of C which I had queued earlier.

It completed sucessfully and I have now been able to enter the computer normally!!

I am very scared of getting the problem back if I shut it down.

I assume I got the BSOD because of a corruption in the AVG files.. as renaming them fixed it. Should I uninstall and reinstall AVG.. or hope that it has now downloaded proper working drivers?