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My bet is this error happens when the download is extracting the archive. If so copy the files from your previous computer to a network share or USB thumb drive. The download file is a self extracting archive that extracts to "C:\Autodesk\Autodesk_Revit_Structure_2011_English_Win_32-64bit" by default then auto executes the setup.exe. You can run the setup.exe by double clicking it from the network location or USB thumb drive.
Douglas Lauritsen, Autodesk Product Support