I am running under Windows XP on a Dell desktop. While defragmenting the main C drive I stupidly started up a Solitaire game, which caused the computer to hang. I could not close it down in the correct way, and had to unplug the machine. On restart I can no longer play Solitaire or other games which write temporary files (though email and internet explorer are OK). I get a message saying I don't have access permission to c:\documents and settings\(my name)\local settings\temp. I notice this file, and the ones under it are 'read-only' in properties, but if I change this it goes back to read-only. how do I reset Windows permissions?
A friend said I should re-install Windows, but since that would involve re-installing all my applications as well, I would rather find another way if poss. Please help.