Hi All - I'm typing this from memory, so hopefully it's accurate. I'm on windows 7 on a 2011 Dell Inspiron.
I had some spam distributing virus, so I ran the AVG 2013 update. It detected 60+ errors, but when it told me to reboot, it gets as far as a 'microsoft error recovery' screen with options (roughly) of contuing to boot normally or do a fix. The normal boot comes back to the error recovery, the fix option requests I use the windows disc and reboot - when I do it whirrs and comes back to the error recovery.
F8/safe mode doesn't work, and the F2/F12 options so I seem to be stuck without getting in.
Any help greatfully received.