I would try
www.grisoft.com and grab the AVG free version,and d/l the updates,and then scan again,also
www.lavasoftusa.com and try adaware.Never can be too safe about these things.
I had a virus a couple of days ago,and finally found it when I installed sygate,which is also freeware from
www.sygate.com
I like it better than zonealarm,but it's just an opinion

But I found out that you really need a firewall....the hard way.
<eagle1 beat me to it>