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Mateo posted a topic in Deploying Windows 10, Windows 8.1, Windows 7 and more...Hi, Suddenly I'm unable to open/edit an existing Task Sequence in MDT 2010 Update 1. I click properties on the Task Sequence then click the "Task Sequence" or "OS Info" tab then get an "MMC has detected an error in a snap-in and will unload it". I can click those two tabs on the properties of other Task Sequences and not get the MMC message. Any advice would be greatly appreciated. Thanks!