Yes as mic said it sounds as if

Posted by Cheryl on Monday, 7. June 2010 at 10:02 Bali Time:

In Reply to: Check your computer posted by Mic on Monday, 7. June 2010 at 09:15 Bali Time:

you've got some virus/spyware. Download and run either Lavasoft adaware or spybot search and destroy (or both). They are free and very good.