Need some help on a problem I'm encountering in Vue...

I get the following error when I try to render:

Over 1853 MB of physical memory (RAM) are required to perform the rendering of this scene.  This requirement exceeds your current system resources....

My system has 4 GB of RAM, of which Windows appears to recognize 3.5.  In the Task Manager, I see that I currently have about 2.5 GB of RAM available. 

I am using Vue 5 Infinite and Win XP Pro.  Can anyone tell me what's going on here, and what I can do to correct it?