I just noticed that Panasonic released a new version of P2 Viewer for the PC, which adds Vista support:
https://eww.pavc.panasonic.co.jp/pro-av/support/cs/csregistp2m/ep2main/
Please note that when you install this, all your existing virtual P2 cards are lost.
https://eww.pavc.panasonic.co.jp/pro-av/support/cs/csregistp2m/ep2main/
Please note that when you install this, all your existing virtual P2 cards are lost.