Go to start menu, type troubleshooting and see what you come up with. In addition, do check disk for errors. Also, do a disc, clean up. You may also want to do a search for the website (search by start button) and delete all the entries, that you find.
Edit: Jaycee was posting while I was typing. Try her idea first, It makes a lot of sense.If it does not work, try my ideas. I think we will solve this.