OK so I just tried to overclock in my BIOS with this think called A.O.S (automatic overclocking system) and now my computer wont boot up into windows. How can I fix this?
Look for a jumper on your motherboard, most probably somewhere near the CMOS battery... If you're not sure, look on the manual of the motherboard for the specific jumper and proper procedure on how to reset the BIOS..
Make sure that the overclock was turned off and that all settings are back to normal. You may have to readjust the memory voltage, since normally the BIOS default is lower than normal operating voltage and that can cause instability and BSOD's.