Try raising vDIMM. Go into BIOS, access the AI Overclocking menu, set it to "Manual" and you'll get the option to change something called "DDR Reference Voltage". Increase it to 2.85v.
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I would like to express my thanks to Prof133 as well. A client of mine had a similar problem, and it seemed to have corrupted their Windows 7 installation, as well. Disabling Legacy USB support allowed MemTest to run and after I re-installed Windows 7 it seemed to have no problems.