Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3
System Manufacturer: Gigabyte Technology Co., Ltd.
System Model: G31M-ES2L
Processor: Pentium(R) Dual-Core CPU E5200 @ 2.50GHz (2 CPUs)
Memory: 2038MB RAM
Page File: 708MB used, 3216MB available
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
Your motherboard has a PCI Express 16x slot so it is compatible. Your other hardware seems to be somewhat satisfactory to keep up with the GPU in most games.
Maybe look into overclocking your CPU as the E5200 is very overclockable. If you're at all interested check out our C2D OC Guide. Don't be overwhelmed by all of the info, it is really quite simple once you understand what is going on.