Reviving this thread...

How does this work? Do I simply add a line in Boot.ini saying /3GB startup or what?!
 
Lady, do that: 
1 right click on " my computer " and " properties "

1. Advanced tab
2. At " performance " chose " settings"
3. " Advanced " tab
   5 At " virtual memory " press " change " button
   6: Increase " Maximum size ( mb ) " with 1000 ( 1000 - 1 gb of ram )
4. Press the " Set " button bellow
5. Press ok
   This requires restart opperation, 1 gb of hard drive memory will become 1 gb of ram memory
   If problems please replay.
   Kisses!!!!!! 

Sory to tell you but Poser7 or Poser Pro doesn`t use more then 2gb of ram and I am talking about the " Max Bucket Size " , there are no diff. between 200 or up to 800 Max Bucket size whatever Poser version or whatever 32 or 64 bit sistem. Anyway, youre processor rules, I have something much, much more worse than your. Install 64bit for VUE7, vue7 use how many ram you have.

My C is alos 20 gb, I have on C my windows, my program files and just 7-10 gb free. I got that error you mentioned about only when my C have only 500-900 mb free space. This may be one of the causes.

Poser allways generates hi-res textures into " C:Documents and SettingsAdministratorLocal SettingsTempPoser ProPoserTextureCache " ( if you have windows xp ) , you got that error only when your hard drive is fully ocupied. Go to TOOLS- VIEW- SHOW HIDDEN FILES AND FOLDERS and then go to " C:Documents and SettingsAdministratorLocal SettingsTempPoser ProPoserTextureCache " check PoserTextureCache folder, you will se then every time you do  renders new files will apear there. Few scene is enought to reach to 10 gb of hard-drive. Just watch allways PoserTextureCache and you will see what I am tallking about. Also see my image please.Sorry, I`ll post new message with img.
PS: Sorry for my english.

Here is how you fix your problem  http://www.philc.net/WW2_help.htm  ( at the bottom of the page start the video with that green t-shirt named " Joint Parameter " )