So, I am trying to run some video games, right now it is Halo1, Titan quest, and Fable. The game will run fine, but then it will get all choppy for a bit, and then it will run fine, then get choppy. I can run halo on the lowest settings and it will not do it, but I cannot run either of the other two on the lowest settings without it doing it. Here is what I have hardware-wise:

Motherboard: ASUS M2N-MX SE PLUS

CPU: AMD Athlnon 64 X2 Dual Core Processor 6000+

RAM: 4GB DDR-2 800MHZ PC-6400 (Windows XP only recognizes 3gb)

Video Card:XFX PVT96GYDSU GeForce 9600 GT XXX Alpha Dog Eddition 512MB 256-bit GDDR3 PCI Express 2.0 x16

OS: Windows XP Home w/ SP2

There is pretty much nothing else running other than the game, just my mouse software. I have had the Task Manager Performance tab open while running the game, and the CPU usage did not go above about 80%. I also downloaded a program that would monitor my ram, and it barely went up at all.

What is making my computer do this? Thank you for the help.

im not sure but try uninstalling fable and halo might work and try uninstalling halo and fable might worked because i was the same for some reason with WoW and counterstrike source and now i just play them i play the original cs lol. i hope i helped in any way

u should upgrade it