You can look in the reliabilty monitor, find the event, view details, you'll find the stop code there. Kind of irrelevant when you incorrectly OCed (not a smart thing to do) but you can check anyways. OCing is simple on SB but not that simple. You are supposed to stability test, checking vcore and temps for at least 1 hour, how else would you know it's safe? Unless you like to throw away money.
I'll just give you the quick and newbie way to oc. First, get cpuz, hwmonitor, and prime95. Now in bios, keep your multi at 45, change the vcore to offset, set it to +.05. Now in windows, open all 3 programs, in prime run large fft. Tell me core temps and vcore. Temps need to stay below 72C and vcore should be around 1.3v (over 1.4v will cause more degradation than one would like). If not, you can stop prime and adjust the offset. You will need to run prime for at least 1 hour without errors or bsods.