I use Windows Vista Home Premium 64bit on a laptop with integrated graphics (as opposed to a separate graphics card). WoW and Carbonite are both up to date.
I had the exact same problem just the other night. It went to the extent that the only way I could exit WoW was to "crtl+alt+delete", start the "Task Manager" and close WoW that way. However, I restarted WoW and everything was just fine. Everything worked the way it was supposed to, so I just went on figuring it was. somehow, something I did. Guess I wasn't alone.
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