The problem is that Windows 32bit programs can't access more than 2gb of ram.

Looking at the figure sizes on the screen a full res texture is a complete waste of time, you won't be able to see the little details anyway. I would reduce the textures in a paint program to 50% or even 25% of their normal size. Each time you half the image size you reduce the ram required by 4.

Also you can use the same texture on both figures and reduce your ram needs by half.