The key is to right click on the setup/autorun icon and run as adminstrator even if you are an Administrator on the local computer.
look here
https://websmp106.sap-ag.de/~sapidb/011000358700001241092005/ https://websmp209.sap-ag.de/~sapidb/011000358700000310652008E.pdf
https://websmp202.sap-ag.de/~sapidb/011000358700001241092005/