Reformatting a DELL computer to factory setting (from recovery partition)

I am unable to restore my computer from the recovery partition. When I
double click Tools\PCrestore I get the message below and nothing
happens.

“Access to \Tools\dp.sc was denied.”

Could you please suggest me what I can do to restore this computer
from recovery partition?

Hi…

This is something you have to perform before Windows is booted. Does the BIOS screen give you a key number to press to start the restore process?

Edit: It might be the F8 key. When starting the system tap on that key (when you see the BIOS screen) until you (hopefully) see a menu.

Best Regards…

If your using vista, Check the following tutorial:
http://www.ehow.com/how_2134715_dell-windows-vista-factory-settings.html