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I have had a number of customers whose systems have been able to boot , start Windows and log on but when loading the user profile an error in Explorer has prevented correct operation of the system. This has applied to both normal and safe mode. This makes it difficult to resolve the issue as the logs are inaccessible. The easiest workaround, that I have found, to this is to create an additional administrators user so I can access the logs and diagnose the problem.