If you have already taken a backup of your data or if you are ready to loose your data then I can give you steps to perform dell factory Restore which will bright your dell computer back to original settings when you first bought this computer.
If you are using Window XP then follow these steps:-
Turn off the computer by holding down the power button for 10 seconds>>Turn it on>>as soon as you see the
dell Logo start pressing
Alt+F11 so keep pressing
ALT AND F11 together>>now you will have window xp recovery screen>>now follow the on screen instruction and click next and next and finally you will get your desktop back.
if you are using Window Vista or Window 7 for for these steps:-
..
Turn off the computer by holding down the power button for 10 seconds
restarts, 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.
3. Log in as a user who has administrative credentials, and then click
OK Now click on the last option dell emergency backup/dell factory restore
now follow the onscreen instruction and click next, next and fianlly you will have your desktop screen.