The "overclocking failed" message means that your computer has crashed, or required more than one attempt to boot. This normally happens when trying to overclock a computer, but in your case, it means you have some kind of hardware or set up problem.
It also means that your motherboard does not think it is in stock setup...
There are very good fault finding guides on toms hardware, I suggest you try going through one of them. The main question to ask is... what component is causing my computer to crash..... and it may not be the memory!