Ok, so on my one computer when I log on, I have about 30 seconds until WoW either disconnects or freezes up and I have to reboot. It only does this on that computer, and on none of my others. I haven't tried the test realm yet though, keeps saying "Unable to detect correct game client" so I'm gonna try re downloading the client and see what happens.
EDIT: So my question is what can I do to fix it?