Leave Bios alone. Describe EXACTLY howthe system fails.
(1) Do the hard drive light flicker on when you boot ?
(2) Do you see the norml BIOS messages?
(3) Do you see a 'starting windows' message ?
(4) Do you get 'no system found' type messages (corrupted master boot record,e tc.)?
Tell the forum exactly what you see when fail to get windows to boot.