I had the same issue a while back and google cleared it up for me. Mine was fixed by playing with the registry keys. If you're not comfortable with that, you might want to find somebody who is or hire somebody to help you. You run the risk of, if you'll excuse my vernacular, ruining a lot of shit if you do something incorrectly.
My fix went something like this (care of jenk):
http://forums.afterdawn.com/thread_view.cfm/133595
Quote:
1. Start Registry Editor (Regedt32.exe).
2. Locate the UpperFilters value under the following key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
3. On the Edit menu, click Delete, and then click OK.
4. Locate the LowerFilters value under the same key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
5. On the Edit menu, click Delete, and then click OK.
6. Quit Registry Editor.
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I hope this helps you, but don't do it if you can't afford the time to fix it if something goes wrong.