I don't understand Holder, you should have the factory installation disks for your PC (unless you bought it 3rd party and they didn't give you them). If you have the factory disks then you should be able to simply reformat the hard drive and reinstall the OS. That would correct the corrupt system files as they would be back to installation default.
To do this you just stick the first disk in and boot, then press “any” key to boot to the CD (the instruction to do so will be on the screen at the time for you to do this). Then follow the instructions on the screen. Not very hard at all but let me know if you need further guidance.
Now if you already did that and you still have issues then you may have bad sectors on your hard drive. Boot up and key pressing F8 until it gives you a boot options screen. Choose to boot to a command prompt.
Once in the command prompt type: “chkdsk c:” without the quotes. If it states that you have bad sectors after it runs then well you have 2 choices.
1) Run this: “chkdsk c: /f /r” again without the quotes which may help you…
2) But you are better off buying a new hard drive which is option 2.
Please let us know if you still have issues.