CMOS Checksum Error, By Virus?

I was downloading a file with Kazaa. When my computer bogged down, so I shut it(my computer) down. Now I can’t restart, everytime I try I get the message “CMOS checksum error – Defaults loaded. I Press F1 to continue & nothing happens. Also I press DEL to enter setup & nothing happens.

I have a MSI K7n2 Mobo, several different speeds of DDr Ram, A AMD 2600XP Processor, ATI 9000 Video card.

It was all working fine until “The Kazaa Incident” any suggestions would be welcome