Does this happen no matter what kind of file you try to open?
It could be as simple as you don't have the right software installed that can open this kind of file, or it may be an infestation of a virus of some kind. I would need to know more to really say.
Try to open a file that you are positive you have software to open it with. Even just try right clicking on your desktop someplace and choose New --> Text Document. Find the icon on your desktop that you just created, and try to open it. If you can't, then you either have a virus or some serious corruption on your hard disk. My bet would be virus. Do a good thorough virus scan with something like Avast (
www.avast.com). I like avast because it has a boot-time scan, which scans your computer after you reboot and before Windows starts.
Good luck! Let me know if I can help any further.
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