my pc has these specs--
Time of this report: 9/26/2013, 20:25:05
Machine name: WIN-PC
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_rtm.090713-1255)
Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.
System Model: Vostro 400
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2.4GHz
Memory: 4096MB RAM
Available OS Memory: 4094MB RAM
Page File: 1778MB used, 3313MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 32bit Unicode
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Input Tab: No problems found.
It's typically very difficult to upgrade components on a computer that was purchased pre-manufactured. Most of the main graphics cards you would require to run games at good frame rates would likely not fit inside of the case. Before I become too discouraging though, open it up and see how much room you have for a graphics card. That would be the main thing you'd need to upgrade for playing games.