Funny thing. A few minutes after reading this thread, I sat down at my new XP Media Center PC and saw the same 'omgjbox.exe has encountered a problem' error. But I wasn't trying to import when I got the error message.
I remember seeing something on Sony's site referring to a fix from Microsoft to fix a problem with SonicStage on XP. I'll followup with another post if I can find more information on the problem and fix.