1. Begin by placing your Windows Recovery CD into the CD/DVD drive and closing the drive. Next power on your computer and wait for the 'Press any key to boot from CD' message to appear. Press any key to enter the Windows Repair/Restore screen.
2. Wait until you see the 'Press R' to restore option or 'Press Enter' for a fresh install. Press the 'R' key. You will now be asked to choose the installation of Windows you want to repair. If you only have one OS on your PC, choose the one option you want to repair and press 'Enter.'

3. Enter your administrator password if prompted, then type in 'cd \windows\system32\config' without the quotation marks. You will want to make sure that the 'ren system system.bad' error occurs, at which point you'll type 'copy\windows\repair\system' and let the files copy to your computer.
4. Remove the CD from the drive and reboot your computer to test if the copied system files have successfully been repaired.
5. Press the 'Enter' key to do a fresh install of Windows over your current version if the 'Repair' function does not work. Simply allow the installation to proceed until complete.