ITunes 10.6 and iPhone 4 iOS5.1 100% CPU utilisation and cannot revert to iTunes 10.5.3

Upgraded my iPhone 4 to iOS 5.1 and ITunes to 10.6.  As soon as I start iTunes to sync my iPhone the CPU utiisation jumps to 100%.  I have run 'netsh winsock reset' and restarted my PC before opening iTunes following previous similar problems.  On cancelling out iTunes it takes a backup such that when I tried to revert to iTunes 10.5.3, which had been working for me, the backup is now incompatible and I am likewise unable to sync.  Help please - anyone else experienced similar or the same?

Reinstall the Apple Mobile Device Service.  See http://support.apple.com/kb/ht1747.

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