system
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Thanks for your help. However I have not been able to solve the problem. For those who don’t know, the Avast Uninstall Utility will run from a BootCD, but will not remove anything from the registry of the OS installed on the HDD. Only the files in the Avast directory will be removed.
Now I will check some more for root kits or other malicious code before I reinstall Windows 7 to have the computer back in action.