- Start the computer.
- As the computer starts, press the F8 key until the Advanced Boot Options menu appears on the screen.
- Press the (Down Arrow) to select Repair Your Computer on the Advanced Boot Options menu, and then press Enter.
- Specify the language settings that you want, and then click Next.
- Log in as a user who has administrative credentials, and then click OK.
- Click Dell Factory Image Restore.
- In the Dell Factory Image Restore window, click Next.
- Click to select the check box for Yes, reformat hard drive and restore system software to factory condition.
- Click Next. The computer is restored to the default factory configuration.
- When the restore operation is completed, click Finish to restart the computer.
Reference : http://oem.windowsreinstall.com/dell/dell_vistahdd.htm
