I have a Dell M2010 that I recently upgraded from Vista to Windows7. Worked fine til I got on internet, sound quit and it told me my copy of Windows was not genuine. I finally got my Windows7 code input correctly, and everything seems to work fine except I have no sound. I checked my drivers, did update and it told me I already had the correct driver. I'm not muted, and sound is turned up. This thing has 9 built-in speakers and it sounds really nice. Any suggestions? Thanks