Thank you Halladayrules for systemrestore!!!
I recreated it from the broken zip file which did likely contain the version 1 installer, but it works for me, even in safe mode (all programs | accessories| system tools| system restore).
Just in case you were not aware, the RapidShare v2 link appears to be no longer enabled for sharing (RapidShare: The download for this file has not been enabled. Only the user who uploaded it, can enable the download option).
This systemrestore is quite useful when an software update cases problems. Thanks again!