I upgraded today from Windows XP to Windows 7 using a copy I paid for and downloaded from my school's software store. After upgrading, everything works great except the sound. I get no sound at all. My motherboard is a BIOSTAR TF560 A2+ and the onboard audio is RealTek HD Audio. I cannot find any Windows 7 drivers for the motherboard but I found Windows 7 drivers for the audio device, but still nothing. Anyone know what could be wrong?