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When installing ArcGIS, Windows returns the following error:
Error: Error 1904. Module C:\arcgis\arcexe8x\bin\xxx.dll failed to register. HRESULT -2147467262. Contact your support personnel
The Microsoft System Files were not properly updated or there are environment variables with blank values.
The following solutions are in order from most likely to least likely.
Note: See the Related Information section below for the solution.
IMPORTANT: Do not delete or remove dao360.dll when installing ArcGIS Desktop 9.0 or greater