Here's another list of software you can try. I used girder... i actually like it better than irassistant, but it doesn't seem to dock in the task bar.
however, it also shows the same exact problems. I suspect the PCTV software in win2k + WinLIRC just don't like each other... I don't know how much of a conflict it really is, as this tv card has preset remote commands for both irassistant and girder...
I really hope there's some work around.. i really wanted this remote for the tv/dvd/winamp features.. tv and winamp being the most useful.