Overclocking my old pc

HP uses a locked bios, this is to prevent users from overclocking.

If users screwed their system by overclocking, HP and other companies would get many complaints.

yeah unless you buy a new motherboard, and i think you would be hard pressed to find one that old, you are going to be out of luck for overclocking.

The only thing you could try, **and this is a long shot and could brick your board**, would be to find and unlocked BIOS and for your board and try flashing the bios. But like I said that would be a long shot and you would have to be careful finding a compatible one and even then you could still have problems with it.