Run a deep scan immediately.
I am assuming that your anti-virus dat files are current, or you will have a problem.
Some self-replicating viruses are a pain toi get rid of. Some are impossible short of formatting.
I have had to format hard drives for two clients that I could not clear for them.
One was an engineer that turned off his anti-virus because it slowed down his porn - he actually told me that.
Spent 2 full days on his system - a friggin nightmare.
Three months later he called with the same problem, same cause.
Told him to take his business elsewhere. (I don't charge a fee for support).
if you are infected, and can't clean it up with a deep scan, write down all the virus names that you see.
For the real nasty ones, there are sometimes separate cleaner tools that target that one specific virus.
These cleaners are produced my Norton and MCAfee, and usually work well.
I will check back here on Friday, and send you my phone number if you can't get some local help.
Good luck.
PS: HIghly unlikely that it came from CF.