Ernesto
A 32 bit PC will not run a 64 bit application unless you can run some sort of “virtualization” OS on the 32 bit PC, I have heard of people trying this method but as far as I know it is very complex and would be cheaper and much easier to purchase a 64 bit version of XP and load it on to your XP computer and set it to offer the option to launch either the 32 bit or 64 bit OS at boot up so you could then still run all the 32 bit applications on the PC when you needed to and any 64 bit ones when needed, just a pain swapping back and forth, probably cheaper and a lot easier to just buy another PC with a 64 bit OS on it
The guy who would know best on this stuff is probably “Burrman”, he is great with computers
Regards
Rob