GAEP45UD3P realtek hd audio freezes out of standby

Hi, I have the above motherboard GA-EP45-UD3P with one of the Radeon 4850 cards with the HDMI audio (which I'm not using at the moment). I notice that if I get the computer to enter standby, and then wake it up again, the Realtek HD Audio Manager freezes (I cannot right click it), alone with volume manager, and if I go into the Control Panel, that freezes up. I can't do a full shutdown, or terminate the process, or anything. So I have to either reboot or do a cold shutdown. I loaded the drivers from Gigabyte, and the Radeon card has its own drivers for the audio, too; should I just get the drivers from Realtek and install them on top? Do I need to uninstall anything? (http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=8&PFid=14&Level=3&Conn=2) Also, how do I know if I should be using the HDA or AC'97 drivers.

Thanks,
- Eli