thanks for your guys help...ya i was thinkiing that i was going to have to re-install windows neways.. I have XP by the way. Well ya i posted her to maybe find a solution cus ive had this for a while and i figured the only solution would be re-installion of XP. But if anyone else had nemore ideas just post
If you have the Windows XP CD, you can begin the setup and installation process. At a certain point it scans the computer for existing installations. At this point it gives an option and chance to do a repair on the existing installation. This might fix the problem and save you some grief. It kills all the system files required by windows and reinstalls them straight from the CD.
If this does not work, go into the Recovery Console and type "chkdsk /r" without the "" marks. This will check the system and has many times saved me from reinstalling windows.