I switched around all the ram in my computer and I still got the same problem on the same module. So it isn't the actual RAMs fault.
Okay so I bought my Vista computer and everything was fine, for gaming I upgraded my PC with some additional DIMM DDR2 from two sticks of 512 to four sticks of 512 (four modules overall) however one of my modules won't show that there is RAM inserted and won't use the RAM after checking both in bootup and with SiSoftware Sandra. I'm thinking a broken module on the motherboard is the problem, but I came for some second opinions before cashing in the warranty. Speculation?