said by John_W:RAM is dirt cheap. I paid just under $50 for 2 sticks of 2GB DDR2 for 4 total.
Newegg has some DDR2-800 on sale now for $37 for 4 GB.
I threw 4GB in my 32 bit machine Vista Ultimate computer(it was cheaper for me to put 4gb in than 3gb). It'll access 3.581GB of it and I am currently using 2.180GB of that right now, so adding a few more sticks to your machine won't hurt. It'll most likely help, and it is not that expensive.
NEWEGG! That's the place! LOL I couldn't think of the name to save me! LOL. Thanks. Now I just need to figure out how to see exactly which type of memory I need.