Hi, thanks for taking the time to read. My bother is eight and is using an old emachines T6414 with AMD Athalon 3200+ and 2 Gigs of Ram. I would like to know if there is any way to upgrade this system to make games playable? He likes minecraft, portal, and TF2. His monitor is 720p. I'm in college so my budget for him is around 100 USD. Thanks again for your time.