i've flipped through a bunch and none seem to meet you description.

i think we need more info:
did you open an attachment?
what was the attachment named?
did you open an e-mail?
did you go to a web site you normally don't go to?
are there any error messages?
do you have firewall protection?

here is a link to most virus images. flip through and see if any of these meet your criteria.
http://www.sophos.com/pressoffice/im...img/index.html

it could be your computer is f@$%ed up and not a virus at all.
what were you doing when this started to happen?