Glitches, Memory Errors and Much More :(

After building up my PC I've been, for the most part, having little if no problems until recently. I started noticing that when I'd play certain games or use the computer in general I'd start to have all sorts of weird issues. Ie: Programs wouldn't open, or would crash often or things of that nature. Sometimes in games like GHIII some of the chords wouldn't show up. I had a feeling initially that it was a graphics card issue(something I'll verify when I get my new 8800gt in the mail) but I think its my motherboard or memory module set. To test it, I tried running memtest86 on bootup and I got errors. It claimed there were 255 errors on each module slot. So I tried removing memory one by one but kept getting the same number of errors and issues. I tried it with my older memory from my previous computer and ran into the same problems and the same numbers. So I'm not entirely sure what the problem is or how to fix it. But if anyone has an idea I'll list my specs here:
eVGA 680i SLi Motherboard, DDR2 5300 (DDR2 667) Crucial Ballistix Ram, e6850 Intel Core 2 Duo, Sapphire Radeon x1600 Pro graphics card, GameXStream 700W PSU.

Thanks in advance guys and thanks for reading.