|Oops, sorry, I somehow missed the bit about no longer being able to get into BIOS. |
Too many late nights on here perhaps.
Unplug the power cord and hold the power off button in for about 10 seconds. I'm not hopeful but its an easy thing to try.
If it's a PC (rather than a laptop) then you should be able to reset BIOS to default by removing the CMOS battery for a while. Alternatively there might be a jumper you have to shift to reset BIOS. The latter would be in the mobo manual if you have one. Often they can be downloaded.
It might be worth googling "Boot Sector Virus" because that seems a vague possibility.
Always pop back and let us know the outcome - thanks