Dell Inspiron 1526 (Late 2007) - Manual (Page 133)

Troubleshooting
131
1 Restart the computer. To do this, click Start → → Restart.
2 As the computer restarts, press until the Advanced Boot Options
menu appears on the screen.
NOTE:
You must press the key before the Windows logo appears on the
screen. If you press after the Windows logo appears on the screen, the
Advanced Boot Options menu will not appear on the screen. If you do not see
the Advanced Boot Options menu, restart the computer, and then repeat this
step until you see the menu on the screen.
3 Press to select Repair Your Computer on the Advanced
Boot Options menu, and then press .
4 Specify the language settings that you want, and then click Next.
5 Log in as a user who has administrative credentials, and then click OK.
6 Click Dell Factory Image Restore.
7 In the Dell Factory Image Restore window, click Next.
8 Select the Yes, reformat hard drive and restore system software to factory
condition checkbox.
9 Click Next. The computer is restored to the default factory configuration.
When the restore operation is completed, click Finish to restart the computer.