Yeah, OEM mobo's are pretty locked down so you can't OC much, if at all (fewer warranty issues). A new mobo is probably your only option if you want to OC. That, of course will almost certainly require you to reinstall Windows, and even if you don't, the OS is probably OEM and tied to the mobo it was originally installed on (would fail validation).
Hey thanks DJ reallly appreciate the input. I have updated everything except the mobo. Went from windows xp to windows 7,replaced my video card ( radeon 4350 to 6750 hd) upped memory from 4 gb to 8 gb. and of course the cpu.