As antioed said, this sounds like a spyware/adware problem; follow the advice in this thread to get you started on cleaning it up:
http://www.daniweb.com/techtalkforums/thread5690.html
If you need to post an HJT log, please post it in a new thread in the Security forum.
To help a bit temporarily, try this:
Go to the Control Panel and open Administrative Tools; double-click on Services, see Internet Explorer is in the list; if it is, right-click on it and select Properties. Change Startup Type to Manual. Reboot and see if it helps.
dlh6213
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