The Fix
Go to the bottom left of your screen and hit the 'Start' button, the move up to the 'Run' and type in Regedit.
The Registry Editor will pop up. Follow these paths.
Assuming you are running Internet Explorer. If Netscape follow it's path.
HKEY_CURRENT_USER/Software/Microsoft/Internet Explorer/Main
Go down to to the Start Page on that page, mark it, then go to the Edit button on the top of the page and hit it. Then hit 'Modify'. Type in whatever you want your home page to be.
Once you get back in clean up your Favorites List. You probably have a bunch of trash listings. And get in the habit of cleaning up your box each day.