Eventually you will have to purchase a decent gaming video card and a larger Power Supply Unit (PSU) for quality gaming.
You will also need to purchase a monitor and speakers.
Is this a good desktop for gaming?
This was reviewed by Cnet: eMachines T6524
Windows XP Media Center Edition 2005; 2.2GHz AMD Athlon 64 3500+; ATI Radeon RS482 chipset; 1,024MB DDR SDRAM 400MHz; integrated ATI Radeon Xpress 200 graphics chip using 128MB shared memory; WDC WD2000BB-22GUC0 200GB 7,200rpm ATA/100