Hi, I have been running my 555 chip unlocked to a quad core in 32-bit Windows 7 for awhile now, I recently decided to upgrade to 4gb of ram. Once I installed 64-bit Windows 7, I was no longer able to boot past the splash screen. I have tried disabling ACC, updating my Bios, and increasing my cpu voltage. None of these things have helped me. Currently I'm only able to boot once I disable 2 cores. Does anyone have any suggestions on what to do, or will I really have to go back to 32 bit and render .75 gb of ram useless in 32-bit to keep an x4?