how do i access bios on win xp?

Operating system has nothing to do with BIOS--it'* accessed way before the OS comes into play.
Most computers will display a "press this key to enter setup" message at first boot--usually "delete" or "F2"
Some Compaq'* are different--when you see the little white square at the top right of screen, hit "F10"
IBM I think uses "F12"

What kind of PC do you have? Might be able to give you a more definitive answer

If I need to Access a bios and it doesn't say what to press to access it I press delete, then if that doesn't work I press F1 through F12, I have never not been able to access a bios this way, they are basically always an F button or delelte. Hope this helps.

i found that its f10 but i cant access the processor speed it greyed out why is that?

Either it is on auto, or your motherboard doesn't allow overclocking. Probably the latter.

what u mean by auto

Basically that means that the mainboard and BIOS are auto detecting your CPU specs, and there'* nothing that you can change.
Since you said you used F10 to get into BIOS, it sounds like you may have a Compaq?
If so, there'* very little that you can change in the BIOS anyway--that'* the downside of most "mass-produced" PCs--if you want to be able to tweak settings, you gotta dish out the extra bucks for a better quality mainboard (I run primarily Abit boards, but that'* just personal preference)

well thanx for the help i thought id try at least but its my first computer that i actually own my self and im building my own in a few months then i get to have some fun lol

Ya I wanted to overclock mine, but I think the motherboard won't let you. Plus it'* old. I know on some of the new motherboards will let with the P4'*, but you have to have an awesome cooling system, preferably the water cooled ones. I just got a mag. on overclocking and the overclocked a P4 to 600 Mhz it was supposed to be.