This started happening recently when I was trying to render a scene with 2 V3's and an M3 fully clothes  with props, etc.....  At first, my computer would hang at rendering.  It would just sit there at the 'rendering' stage forever until I had to shut it down with the Task manager.  At the time, I thought it was because my scene was too complex (although I've done more complex scenes before with no problems.) 
But now, I'm trying a simple scene with no figures yet... just a room with some furniture (the whole pz3 file is about 13 MB.)  And now its giving me the above 'not enough memory' message after trying to load a little 450 kb texture to a background! 
I have a Pentium 4 processor (around 1.8 GHz) and 2 GB of RAM.  I also have all the P6 service releases.  Would reinstalling Poser help?
Thanks!