You can't fit your whole operating system on a 32GB drive?Wondering if a 16 gig or 32 gig, or more would be a nice SSD addition for a page file drive, and, browser cache drive?
32-bit Windows can use 3GB or >3GB with PAE, though it is limited by occupied hardware addresses to 3-3.6GB in most cases. There is usually a 2GB limit per process, excepting the few apps that work properly with /3.
XP64 requires a 64-bit system, which you will have to look into, as well as drivers for hardware. I recall that in days gone by AMD was way ahead of Intel in the 64-bit hardware, so you may be out of luck.