After installing Citrix ICA client, this message began to appear. Use this article to enable User Environment Debug Logging: http://support.microsoft.com/kb/221833 When the message appears again, locate the following log file: %SystemRoot%\Debug\UserMode\Userenv.log Look for errors = found Error 32 in my log, which is a Error_Sharing_Violation. This means something had already opened my User registry hive and was restricting my logon process from accessing it in a way it needed to. Microsoft support engineer had me capture a trace of the logon with Process Monitor, by selecting Enable Boot Logging from the Options menu. I then rebooted and attempted to recreate this issue. After getting the message, I opened Process Monitor and it offered to convert the boot log to a standard log, located here: %SystemRoot%\Procmon.pmb. The information within showed that a Citrix process was activating directly before the winlogon process, making it appear that it was doing something it shouldn't. Upon further research, there are articles on how to workaround this issue: Citrix: http://support.citrix.com/article/CTX118226 Microsoft: http://support.microsoft.com/kb/969100/en-us
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