I have an HP Pavilion dv4 that I just upgraded to Windows 7 64 bit and now my sound isn't working. I've read some of the other posts that talked about this and it seemed like it was just a driver problem, but mine is saying that the speakers and the headphone jack aren't plugged in. I'm not all that hardware savvy, so I'm not sure if this could be fixed by a driver or not. Also, all I have for Vista is recovery disks, not the actual vista disks. Anybody know what I need to do?