Suggest me suitable graphic card or any other solution

System Manufacturer/Model Number: Dell D820
OS: Windows 7 Professional 32-bit SP1 (Build 7601)
CPU: Intel core duo T2400 @ 1.83GHz Yonah 65nm Technology
Motherboard: Dell Inc. 0JF240 (Microprocessor)
Memory: 2.00 Gb Dual-Channel DDR2 @ 458 MHz (5-5-5-15)
Graphics Card: 128 MB Standard VGA Graphics Adapter (Dell)
Sound Card: High Definition Audio Device
Monitor(s) Displays: Generic Non-Pnp Monitor (1280x1024@1Hz)
Screen Resolution: 1280x1024
Keyboard: Standard PS/2 Keyboard
Mouse: PS/2 Compatible Mouse
Hard Drives: 56 GB Hitachi Hitachi HTS542560K9SA00 ATA Device (SATA)
Other Info: Optical Drivers: NEC DVD+-RW ND 6650A ATA Device Bios Version: Chip Rev (or A09) Network: Broadcom NetXtreme 57xx Gigabit Controller GPU: nVidia G72M