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When installing ArcGIS 9.x, the following error may occur:
Error 1904: Module C:\Program Files\ArcGIS\Bin\AoInitializer.dll failed to register HRESULT -2147221164. Contact your support personnel.This error is followed by several more failures to register .DLL and .OCX files, as well as other file types.
error 1722The error below may also occur:
error 1721: there is a problem with this windows installer package.The install proceeds to 'roll back'.
ATL.dll, a file that should be installed and registered by Internet Explorer 6.0, is not registered.
Warning: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions; therefore, use caution and proceed at your own risk.
Note: In some cases, it may be necessary to reboot the computer before installation will complete properly.