bios virus

Some BIOS have VIRUS detection. Its really just letting you know something has changed or there was an attempt to change something on the system. Try going into BIOS and you can turn off this warning. In my experiance there are more false positivesthan actual BIOS viruses.

Next thing to try is flashing your BIOS. Try getting the latest from you Motherboard or system Mfr.'s website. Flashing the BIOS should get rid of a virus as all the code is generally rewritten.

If this does not solve the problem try taking out the battery and making sure the system is unplugged. Leave it out for an extended time. Several minutes at least. Ive seen some systems maintain passwords for 5 minutes or so while the battery was out. If the board has a jumper to clear it put it in the clear position and put the battery back(after you kept it out for awhile). try again to see if it continues.

Personally I would turn off the BIOS virus detecter as this is usually more of an annoyance than helpful. If you use an updated virus checker on your system it will catch those kinds of viruses before they can do harm.

Just my 2 cents on the matter

If you have an ATX motherboard, you need to unplug the power cord, and remove the battery to reset the CMOS memory.
ATX systems use the 5volt standby supply to run the CMOS and RTC so that the battery life is long enough.

However, if you have a true BIOS virus, it likely wrote itself into the BIOS program in the 'flash' ROM, and not to the CMOS RAM.

You need to place the flash program and bios program file onto a write protected bootable floppy, and flash the BIOS.

NOTE: the virus will still be present when you boot the PC.
After flashing the BIOS, place the floppy into a different PC and scan it for viruses.
If the floppy has been infected, then you still have the BIOS virus.
Check the Symantec and McAfee knowledge bases for removal instructions.

You may need to physically replace the BIOS Flash ROM.

Chas