My PC is ancient as well, but I know enough about protecting its Windows OSes to have installed quite a few free software safeguards, that also unfortunately eat up a lot of processor cycles and physical/virtual memory.
So this software...err...trialware? shareware? does a very good job of managing active processes, so that I have far fewer instances of program/browser freeze-ups and crashes.
I dont want to buy legacy hardware in the form of registered memory sticks for my ancient Sony-branded BIOS/motherboard with a puny Intel 1.6 GB P4, and cannot yet afford a new or newer PC, so this will have to do for now.