The 945GZ Motherboard is developed by BIOSTAR Group and you can acquire its drivers from the official web page. Click the Download icon next to
I945Z-M7A_1218C_B.exe, save the file to your computer and install it following the provided instructions. If you still have issues with the audio driver, go to Start, type dxdiag and open the utility. After that, click the Sound tab, check your audio card model and download and install the drivers directly from the developer web page.