I have a Dell Optiplex GX260 XP Pro Pentium 4. I need to do a system restore without a OS disk to return my PC back to factory settings. Everything Ive seen thus far says to use F2,F8,F10 or F11 to get to complete system restore. None of these contain the info to do this. I called Dell and they would not tell me without me first paying them a fee for the answer. Any ideas?