from ctrl-F11 probably, should have worked. Strange that it didn't.
From the Vista installation DVD delete the partition and make a new one. This should get of everything on the hard disk. If even that doesn't work, download DBAN or KILLDISK (both free) to fully erase the disk (but you'll erase all Dell-specifics like the recovery partition) also. So that's a very, very last resort.
I have a Dell Inspiron E521 desktop with Windows Vista.
I have a bad virus - I made the mistake of thinking that maybe my McAfee software wasn't really necessary and so when it expired I didn't renew it - lo and behold after a few days I have problems.
Tried a few things but in the end did a Factory Restore having got my personal files off.
This hasn't helped and it now refuses to allow antivirus software to load - I've tried a new copy of McAfee and also AVG.
I do have the Windows Vista installation DVDs so I guess I need to find out how to wipe the entire computer properly so I can start from scratch (including any hidden places - BIOS? etc)
Can anyone help me with this please?