Ram issues

[Istalkeri]

Hi guys, i was hoping some of you might be able to help me with an issue im having, As of late of have been experiencing constant crashes whislt trying to play games or use applications, i tried alot of things thinking it was my OP so i reformated about 10 times with variuos different OP's from XP to Vista back to XP a couple times then win7, i swapped graphics cards redownloaded drivers flash my Bios and still the same problems, i was then told to try memtest86 to test my ram, first test it failed with a catologue of errors, i then tried each stick on its own in each slot, all the ram passed the test, but as soon as i tried to pair it up, the same problems and i start getting errors, im completey stuck now, if all the ram works on its own in each slot, then why doesnt it work paired up? if any1 can help me, it would be most appreshed, as i feel like throwing my cpu out the window and running outside and jumping all over it, i think this problem is seriously damaging my mental well being.
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