Virus and "Spyware" infections can cause those sorts of symptoms.
- If you currently have an anti-virus program, download the latest virus definitions, unplug your Internet connection, and run a full system scan. Of course, you'll need to be able to open your browser to do so- for Internet Explorer, type iexplore in the "Run..." dialog.
- If you don't have an A-V program, get one now; you're just asking for trouble if you don't.
- Read through the threads in our Security forum to find out how to get and install the recommended spyware detection/removal/prevention tools such as Ad Aware, SpyBot, HijackThis, SpywareBlaster, SpywareGaurd, etc. If you do find spyware problems and have any questions about them, please start a thread on the topic in the Security forum.