Computer automatically restarts on startup.

I am running Windows XP PRo. I have an Asus P4P800-E Deluxe motherboard and my video card is an Radeon X800 PRO AGP.

I changed some of my settings in the radeon driver jus tlike anti alising and performance wise. Now whenever I start up my computer it loads for about 30 seconds and then it restarts.

I'd appreciate some help. Also if you know how to get into safe mode, because f8 didn't work.

 

Please elaborate, and safe mode doesn't work with F8.

 

Does anyone know?

 

i think its different based on your BIOS set up...i always end up hitting every F key i have on startup will something works :|

 

okay F5 seems to be my safemode key,

Once im in safe mode I can't open my ATI driver so I don't know how to reset the setings i did from yesterday and I tried system restore already