If you want to capture PAL instead of NTSC on the S-Video you'll need ot edit the following file C:\Program Files\WinTV\TVServer\GenPCI.ini
Add SOURCE_x_TUNER_FORMAT=256 to the Analog Source.
I've done this for you in the attached file so just drop it in and reboot (and empty the database). I'm just mentioning what I did as this applies for any board (to force a particular standard other than the default)
Regarding Extend. Did you purchase the CD from the web store or are you using a CD that came with the product? WinTV Extend only gets installed if you purchased the WinTV v7.2 Extend from the web store.