I think as far as Poser 3 is concerned, you're stuffed... :( The early versions were never designed to work with more than 1GB total memory (i.e physical RAM + virtual memory). There's a memory updater for Poser 4, and for Pro Pack, but they never made one for P3. The 3.01 updater that's at e-front ear is just the "make it stop crashing every 5 minutes" patch, which I assume you already have - P3 was unusable without it.