I have a Dell Dimension 4100 1GHz PIII w/ 128MB of PC133 RAM and a 32MB NIVIDIA TNT2 AGP. Recently, I upgraded to Windows XP and noticed significant decrease in system response. I'm not a hard-core gamer but occasionally play games like Warcraft III, and NWN. If I want to upgrade my system should I focus on the memory or the graphic card? If the latter, what are my alternatives? Thanks.