Today, I received another stick of 512 MB Samsung DDR 3200. I popped it in, booted up, all seemed fine, and windows says I have a GB of RAM. http://dellepro.dellhost.com/eck/props.jpg Various other programs tell me that along with POST. Everything has worked fine today, until a couple of hours ago. I tried opening outlook express, and part of it opened, mainly just the top with a few buttons. The rest was blank. I closed it, opened it again and it did the same thing, except it popped up a message saying "Out of memory" when at the same time, task manager said i had 700 something MB free, as did winbar. Hmm, I closed this buggy irc client I was using, thinking that might be the source of the problems. Sure enough, outlook was fine. Just now, I tried playing Warcraft III. Everytime it was start it would say something like "Error: The application has a memory fault at 0000010103x340. The memory could not be 'read'." That's not the exact error, but close enough. It also said "write" in place of "read" a couple times. Obviously a memory problem. A couple tries at warcraft III later, it worked. I was playing an online game then suddenly the same thing happened. Is just a certain area in my memory bad? Windows seems fine. Also, is there some memory checker program that will tell me if it's bad? Could it be my motherboard? Suggestions please.