How can I install audio driver from BootCamp into Windows 7?

After an uneventful installation of Window 7 (64) onto iMac  cor 2duo OS X 10.6.7.
NO SOUND.
I have tried to replace the Audio Driver HD through Device Manager: it is not working
  a) if I disable the Windows Driver and try to install the Cirrus driver from the BootCamp disc, I am informed that "device already has the optimal driver"
  b) if I unistall the WIndows driver, Sound Video Game Controller disappears from Device Manager-so there is no place through which I can install a new driver.
c) If I start from the BootCamp/Driver folder and select Cirrus and Install, I am again getting the answer that the "device already has the optimal driver"
I am frustrated! Please, can you advise how to proceed?

You do NOT want to disable unless you are not going to use a device.
You want to rollback or uninstall and get Cirrus driver.
Try Boot Camp (Setup) repair-reinstall - to enable the device.

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