There's your problem. your system specs.

You've only got 512 meg of ram, but are loading like 2 gig worth of textures and meshes into poser.

I wouldn't run wih less then 2 gig at LEAST.

Hard drives are VERY cheap to expand.. you can get an external 500 GIG Hd for about $120

Many people's poser runtimes are more then 80 gig!

But available ram is your serious issue with poser right now.

Poser 7 has had two updates.. you'll need to go to the official poser website to download the patches, one issue addressed was memory handling.

Way too many people take way too many things way too seriously.