Ok the 'Stream Pak' does not need any Python Script to run (as such),. If you upload the Contents of the 'Stream Pak' to your x:\Video Folder, to a seperate Dir. e.x Internet TV. You should then be able to access it by going though the 'My Videos' <XBOX-DIR>/Internet TV with seperate Sub-Directories for each Nation provided.
As for XSP, iFilm or Web Media Browser etc, etc...
You need to first hit 'Start' -> 'Run' then type 'cmd' <ENTER> then, 'ipconfig /all'. You'll need to note such things as the DNS Address. ex. xxx.xxx.xxx.xxx. And to place that either in your Main Dashboard (i.e. Avalauch, UIX or XBMC), or XBMC (or both!). Depending on how your XBOX gains access to the 'Net. You may have to configure other things such as a Static IP address for your PC / Router / XBOX.
The best sign to know if your Internet Connection is up and running is when you can view a RSS Feed (Scrolling Text mostly X-S by deafult),. And that you can get the current 'Weather Report' too...