I had this problem. You need to delete your gw.dat file in your guild wars folder. After that, you will have to re-download all the files, it takes a long while joining areas and such, but it will fix it. If the problem comes back, then that most likely means you have faulty RAM and you need to replace the stick(s) that you think are bad and are causing the problems.
I switched out the bad stick of RAM that I had, now no problems, except in NF my computer shuts down, well....not shutdown, but goes into a sleep-mode like state, and I have to reboot it.
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