Click Start

Type: CMD, from the results, right click CMD

Click ‘Run as Administrator’

At the Command Prompt, type: sfc/scannow

This will check for any integrity violations

Restart your system

  1. Insert the Windows 7 DVD
  2. Restart your computer
  3. When asked if you want to boot from your DVD drive, do so.
  4. Choose your language, click Next.
  5. Click ‘Repair your computer’
  6. Select operating system you want repair.