Hi Monalee,

help us to help you…:
please reread the topic linked by david,
answer theose questions here, and tell us exactly WHAT you did and with what results…

e.g.:

what WIN do you have ? Are all ServicePacks and Windowsupdates applied ? Please CHECK !!

Where exactly was the infected File found (full path/folder/filename, e.g. like c:\Windows\system32\virusfile.exe) ?

test the file with OnlineScanners e.g. from Trend, RAV & KAV to get a more specific name. You need to temporarily pause AV-ResidentShield/Monitor/Guard to be able to scan the file online

What did ad-aware, SPYBOT & CWSHREDDER find ?

did you secure your WIN & IE ?
otherwise it might just always ome back again…
and please post the hijackthis-Log