Internet Explorer starts with a unknown page, pop-ups, and sites in your Favorites
Cause: This happens when your browser has been “hijacked” by spyware.
Solution: First off, clean your system of spyware by using both Lavasoft’s Ad-Aware and Spybot Search&Destroy. If no spyware is detected (which is unlikely), or if the problem persists, visit http://hijack-this.net/ and do a free scan of your computer. After the spyware scans, check for the spyware itself, and delete them manually from your computer (including the folders). Note down the names of the folders you deleted. Open the Registry Editor. Find the keys with the names of these folders and then delete the keys. Remember to always take a backup of your Registry!