I have had a legit copy of Windows 7 Professional x64 since December of 2009. Only today did it decide to tell me it wasn't genuine. HOWEVER, I HAD be messing with the registry trying to get my sound to work again, and I imagine that that probably has something to do with this whole issue. The file slsvc.exe is missing from the System32 folder, and the Software Licensing service is nowhere to be found. Is there any way of recovering this things and getting the activation process to work again? I have no restore points to restore to, so I imagine that makes things a little more complicated. By the way, I got this copy of Windows 7 from the MSDN site through my school.
Windows 7 Professional Build 7600 x64