|If it's really a CMOS Bios then you have to reflash your Bios somehow. As your hard disk still boots, you could make a bootable DOS hard disk on another computer, with the Bios update software on it. Then put that disk in your computer, boot from it and reflash your Bios. Once you've done that it should be easy enough to remove any other viruses using a bootable CD.|
As for the password problem, I'm afraid that you are on your own. Site policy forbids discussion of bypassing passwords.
Any other way is going to require you to boot from a CD or USB stick.