Why are you getting max to export it as an .obj file and then trying to convert it afterwards? Just get max to export it as a .3ds and your problem is solved.
With regards to your problem with PCreator, it doesn't look like you're actually encountering a problem at all, just a glitch that I've always had problems with when using that program. I think it has something to do with the pivot point data from the 3DS file.
From the looks of it, the weapon is loading fine. The 3D view in the top left will always show the view at the center of the model itself, while the other three views (Top, Side and Front) show the center point where the model should be. Zoom out in each of them, and then move them into the center on all three counts. This should correct your problem, if I recall correctly.
Also, if you've got the model broken up into parts, Pcreator only likes to load the first part it sees into group 1. If you're only getting one part of the model (looks like you are from the UVs), attatch them all to one part before exporting in max.