Sadly, this is par for the course if you push overclocking too far. Instead of just fixing every little sub component, just buy a new CPU and motherboard (you can probably get by with a new motherboard only, but it helps to have both of them new) and be a little more careful if your overclocking exploits.
When you're getting the CPU back up under load (i.e. WoW, even though it's not really all that stressful to modern CPUs) you're stressing transistors that were already stressed out, whether they be the chip itself, the power regulation system on the board, or other sub components on the board.
It sucks, but it's the price to pay if you foul up.