Dell Factory Settings

I'm using a Dell Latitude D600 (Bad, I know) and I've just recently wanted to restore it to it's factory settings but it didn't come with the disc to reset it.
People say to just go to Start > All Programs> Accessories > System Tools > System restore, and it'll let you choose a restore point, but that still makes my computer act very slow.
Is there any way I can revert it back to it's factory settings without a disc?
It's a Dell Latitude D600, OS Windows XP Pro.
Also the standby button is now shaded grey and won't let me click it, is there any way to fix that?
Thanks.