Have you tried running IE and seeing if you get the same result? It could be that there's an issue with that browser. Personally, I would suggest running a virus scan and seeing if anything has infected your machine.
Windows Outreach Team
I have not tried running IE, but I will next time. I do have antivirus software which scans regularly, always with the same result: "no problems found". I also keep updating this software. Parat34