Device Manager Snap-in fails to initializePublished: Aug 01, 2005
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When you attempt to launch Device Manager (devmgmt.msc), you may receive the following error message, and Device Manager applet will remain blank.
Snap-in failed to initialize.
Login as Administrator (or equivalent). Click Start, Run and type this command:
If you see an Action Cancelled error while opening Device Manager, see here for the resolution.