do you have service pack 2 on your computer? looks like you have the messenger service running still. . .
then download hijack this:
run a scan with it, then post the log on computerforum.com under security. that site is here:
if you dont want to create an account, PM me your log, and i will post it for you
prior to doing all that, make sure that you update and run scans with adaware and spybot like previously mentioned.