Need some help troubleshooting

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I've been having some troubles with my a second stick of 512 OCZ ram I recently put into my WoW machine. It seemed to work fine for about a month or so, but in the last week I've been getting all sorts of crashes and the game wouldnt even reinstall. However when I took out the second stick of ram the problems seemed to go away. I dont even really know where to begin troubleshooting here, so pretty much anything would be appreciated. The motherboard is an IS7, and i just also just put in a new antec psw, so thats not the issue.

(I realize im probably doing something really stupid, so please bear with me )

 

[(cf)Eclipse]

try running just the stick that appears to be bad on it's own... if it works in the slot your other stick of ram was running in, try de-dusting the mobo's dimm slots