jmagee,
If you have a fairly new branded computer, such as HP or Dell you can request 64 bit media from them.
We have several engineers that were hitting a wall due to the lack of resources running 3D solidWorks files. I was able to get XP Pro 64 bit media from HP for free ifthe computer was still in warrantee and for $10 for those that weren't.
It of course required a format and fresh install, but with the newer workstations it was a breeze and i was able to use 8GB of RAM (32-bit has a 4GB ceiling). This mad a tremendous improvement in the SolidWorks handling. The older workstations were not as easy to conmvert but they too showed marked improvement in handling of these huge, multi parts drawings.