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I've had the same problem for years. Would I be right in guessing that this happens after resuming from a low power state? The problem disappeared when I accidentally installed windows on the wrong drive, then installed it again on the right drive. I have no idea why it did it, and no idea why the problem is gone now considering I've reinstalled windows many many times in the past few years and always had this problem. A workaround for it is to make sure your computer never hibernates or goes into standby. Sorry I couldn't be more help.