Pop-up from nowhere 1

[ANormal]

I have a user that after starting up thier PC in the morning, about an hour later, a pop-up window apears from nowhere. They are not using IE and have not used IE prior to the pop-up launching for the morning. It just launches itself after about an hour. Thier start page is set to

http://www.yahoo.com

How can I stop this from happening?

 

[crisc]

Try installing Adaware and run a scan on the PC. It may find and let you eliminate the cause...

 

[ANormal]

I did and it found a bunch of stuff. Thanks for the reply.