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21 Jan 2011  

Windows 7 x64 pro/ Windows 7 x86 Pro/ XP SP3 x86

Desktop Window Manager is responsible for the graphical effects in Windows such as aero, 3D effects, live windows previews and windows transparencies.It means the grafix subsystem is being overused.Try turning off aero and other eye candy and see if it helps.

You have 4gb ram, otherwise one would have suggested adding ram. What programs were you running at the time of these events?
My System SpecsSystem Spec