Win 7 Soundmax Audio Driver

My Windows XP installation has a Soundmax audio driver. Having now the ability to dual boot my computer to Windows 7 I have since learned that there is little likelihood of Soundmax producing a driver compatible with Windows 7. Windows 7 Device Manager indicates under Sound Controller. what it refers to as a High Definition Audio Device and that the drivers installed are working properly but still no sound. Attempts to update these drivers report that the drivers in question are up to date. There is no indication by yellow exclamation marks that anything isn't as it should be in Device Manager.

Any suggestions for restoring sound would be appreciated