I got this error and I found an answer from a site called ComputerBoom.com. But the exact steps mentioned in the site didn’t work for me. So thought of posting what really worked for me.
1) Open device manager (start -> right click my computer -> properties -> hardware -> device manager) click "system devices" disable "microsoft UAA bus driver for high definition audio"
2) Install realtek driver.
3) Open device manager click "system devices" disable "microsoft UAA bus driver for high definition audio"
4) Uninstall "UAA bus driver" make rescan devices (Please keep the realtek driver installation CD inside the CDROM for the system to scan and reinstall it)