You will normally have a 'reset to defaults' option in the bios, selecting this will turn of any overclocking. Another option is to use the cmos jumper to clear bios settings, this is a couple of pins on the motherboard often near the battery and labeled something like 'clear cmos' or 'reset bios'.
Go through the bios settings before doing either of these, there may be some settings you need to adjust after reseting, 'onboard audio' and 'boot device priority' would be 2 I always have to change as well as setting the time and date if I reset with the jumper. I usually take photos of the screen for each page of bios settings just in case.
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