Did you get the other problem sorted out , from your other thread?
It's the same computer correct?
The problems could all be related as Moi suggests - virus or trojans, spyware etc.
here's a link with some anti virus & such -
http://neurotalk.psychcentral.com/thread46995.html
and the useful sticky- plenty of free pgms listed -
http://neurotalk.psychcentral.com/thread4535.html