iTunes 8.2 Apple Mobile Device Support ...

I am unable to complete the full 8.2 install on my machine - the AMDS component fails to install, although the rest of the packages go in successfully. Unfortunately, without AMDS, I can't sync' my iPhone 3G, nor my iPod.
Having broken out the AMDS package from the 8.2 installer .exe, and tried to run it separately from the command line with logging enabled, the error appears to occur while trying to install the USB drivers themselves - the relevant lines are inserted here:

DIFXAPP: INFO: ENTER: DriverPackageInstallW
DIFXAPP: INFO: Installing INF file 'C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers\usbaapl64.inf' (Plug and Play).
DIFXAPP: INFO: Could not open file C:\Windows\System32\DriverStore\FileRepository\usbaapl64.inf_amd64_neutral_b6bcda7a7950fa43\usbaapl64.inf. (Error code 0xE0000003: The syntax of the INF is invalid.)
DIFXAPP: ERROR: PnP Install failed. (Error code 0x3EE: The volume for a file has been externally altered so that the opened file is no longer valid.)
DIFXAPP: INFO: Attempting to rollback ...
DIFXAPP: INFO: No devices to rollback
DIFXAPP: INFO: RETURN: DriverPackageInstallW (0x3EE)
DIFXAPP: ERROR: encountered while installing driver package 'C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers\usbaapl64.inf'
DIFXAPP: ERROR: InstallDriverPackages failed with error 0x3EE
DIFXAPP: RETURN: InstallDriverPackages() 1006 (0x3EE)
CustomAction MsiInstallDrivers returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
Action ended 21:16:25: InstallFinalize. Return value 3.
Action 21:16:25: Rollback. Rolling back action:
Rollback: MsiInstallDrivers
Rollback: MsiRollbackInstall

I'm unable to break open the .msi fully because it is apparently 'corrupt', although that doesn't seem to stop Windows having a go. That said, the little that I can peer into it, the relevant .INF file mentioned in the log appears to be zero length.

Backing out the full install and downgrading to 8.1.1 seems to work fine, except that now MobileMe won't work because it's keyed to iTunes 8.2!!

Has anyone else seen this problem? Has anyone else got a valid AMDS .msi file I can try?!

Thanks,

ANdy

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Orignal From: iTunes 8.2 Apple Mobile Device Support ...