Your PC with XP is not getting MS security updates. We have some old XP machines here at my work and security is blocking them from accessing the internet. If you add 2 gb of ram your 32 bit machine will on use a little over a 1 gb of the 2 gb of ram. I would look into an i5 processor with some kind of Nvidia or ATI/AMD graphics processor. I would get a machine with 8gb ram and a bigger hardrive.