[SixOfSpades]

Well, since you've gone to the trouble of asking this question I'll assume that you don't have a backup Save.....but it does sound like you're very early in the game, is it too late to start all over?

Even if you do get Jan to spawn, he'll proably be still screwed up. In my last game, I chose the wrong dialogue option:

Jan- "Would you be interested in a bit of merchandise, my friend?"
Me- "Not at this time, gnome."

And he wouldn't speak to me again. Jan- has nothing to say to you. "To hell with that," I said, "Time to bring out the power of Ctrl-Q." And hey, there's Jan, with all his equipment and sound files, he even banters with the party....

.....except that his quest wouldn't start. Some game variables had gotten screwed up somewhere, and there wasn't a damn thing I could do about it.