If you do, and you’ve tried to do a system restore via;
Ctrl + F11 and had nothing happed, the chances are that you have at one time or another did a "fixmbr" or "fdisk /mbr". This will remove the DSR “Dell System Restore” from the MBR. I post this because I ran into this very issue. I found the fix and it worked great. Read the whole article prior to this procedure.
DSRFIX