finally it happened - I had to wipe my windows installation and reinstall everything from scratch. Now I cannot find my original trackIR software CD anymore

So I went the the website and to the download section: here I get a "TrackIR_4.1.030.Final.B" offered. I downloaded this but it does not work:
Setup starts but I get an error:
Internal Failure
Error number: 0x800040707
Description:
Then the setup continues but comes up with empty licence agreement, weird default install location and if I point to a proper folder on my HD I get
Unhandled Exception
Error Number: 0x80040705
Description: String accessed out of bounds
and Setup quits.
I found a link to "TrackIR_4.1.028.Final.exe" in the other thread but this does exactly the same

please, I need a working driver installation for
TrackIR 4 Pro, WindowsXP Pro SP2
thank you
Jens Ansorg