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>What version of Windows is on the laptop?
Win 7 x64. Thanks for the links, the best I could find out was that it was related to the sequence in which the drivers were installed. Some people solved...

The machine is an HP DV7T-7000. The latest audio driver is installed from the HP site but afer a reboot, the driver has disappered. The owner has had this problem for a year and been working around...