strange sound driver

Strange sound driver problem

I have a puzzling problem - apparently with my sound device driver. My machine has a C-Media High Definition Audio Device onboard (driver v5.12.1.8) and a Logitech HID cordless mouse and keyboard.
Everything works correctly except that, if I start up or reboot with the audio device enabled, I lose the keyboard and mouse.
If I boot with the audio device disabled the keyboard and mouse work fine - I can then re-enable the audio device and everything works OK for the remainder of that session.
Any suggestions appreciated.

Windows Vista

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