Although I don't know why it happens, wireless KB / Mouse setups seem prone to that symptom. Do you have wired alternates to test with? Also, if you have PS/2 wired as well as USB wired input devices, you can try swapping one for another (or in the case of only USB, unplugging the input device, waiting a few seconds (at least 20), then plug it back in again.
If you are using wired input hardware, and the above doesn't help, please review Chris' instructions (post #3 pinned at the top), and if you still need to consult with your fellow gamers, use the second half of his message as your guide.
Gorath
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Modifié par Gorath Alpha, 23 février 2010 - 06:05 .