Best thing you can do atm is do a full virus scan :
http://housecall.trendmicro.com/

then i suggest gettign some antivirus software like AVG

but if you dont tell us what OS/Defences you are running which makes it hard to answer the question

if your running an unsecured box (no firewall/antivirus/etc) I suggest a full format and reinstall as who knows what else you ahve picked up.

v_Ln [/B]
I use Norton System Works 2005 & Norton Personal Firewall 2005