I believe you should install it as if you were installing it for any other program to use.
Check out this section in the help file to see if how to set up the sound card in PB:
http://www.coolux.de/root/downloads/support/Documentation/Helpfile/index.html#asio_audio.htmIf it supports ASIO it will show up in the drop down menu in the Configuration tab.
One highlight from that document to keep in mind - you will not be able to use both at the same time and have them both synced together - you can only use one of them as the 'timecode master'.
I've been using external cards (RME Fireface) - it's got a wordclock in and out so I can sync the cards IF I have to - it's only come up on 2 shows thought where I needed to do that.
Cheers,