have you changed any setting regarding shortcuts or installed anything? sounds stupid but anyone could do it =/
edit:i was going to delete it as you solved the 1st one, but it could mean the same thing for this one i think...
is it in properly too?
http://forums.techarena.in/showthread.php?t=669692
http://www.windowsvistauserguide.com/control_pane...ware_and_sound.htm (go about half-way down)