This problem has gone on for months!
This is a special built machine, so I have no manufacturer to go to.
The exact error message is "The current Dolby audio driver version is 7.2.8000.14, and the software application expects driver version 7.2.7000.7. Please install a valid driver and software application combination." This occurs every time I start Windows. My basic sound functions still work, in contrast to some of those who also report this message in various forums.
I have Dolby Home Theater, shown on the All Programs menu as "Dolby Home Theater", "Dolby Home Theater.lnk", target "C:\Program Files (x86)\Dolby Home Theater v4\pcee4l.exe".
In Device Manager, Sound, video and game controllers I show "AMD High Definition Audio Device" and "Realtek High Definition Audio". The AMD disk shows "Driver Ver 12-130", properties, details, shows "Driver Version 18.104.22.16812", supplied by Advanced Micro Devices. Realtek properties, details, shows "Driver Version 22.214.171.12410", supplied by Realtek.
The motherboard is Intel DZ77BH-55K. The box has a Dolby logo, but Intel is no help. No one there will profess any knowledge of Dolby, much less how to repair my situation.
The OS is Windows 7 Professional, 64 bit.
The CPU is Intel i7-3770, 3.4G.