Pinnacle have released an updated Windows XP driver for their PCTV cards:

What´s new

Base driver [revised]
TV app [brand new]
WebText [brand new]
WinNT4.x/2000: - VBI data support
WinNT4.x/2000: - PCTV Assistant app

Download Pinnacle WinXP 4.0 PCTV Driver