[Blunt]

I was thinking of changing my graphics card to a more enhanced one, I'm no pc nerd and I know absolutely nothing about the systems, so I need some help with this if possible. I have researched but as I know nothing I don't seem to understand anything.

I looked through my PC manual and I have a ASUS P5G41T-M LX2 Series motherboard, and my Graphic Information says

Intergrated Intel Graphics Media Accelerator (Intel GMA 4500)
Supports max. shared Memory of 1759MB
Supports RGB with Max. resolution of 2048 x 1536 z 32Bpp @ 75HZ.

As I said, I'll provide people with my pc specifications if you need it, but remember I have no knowledge of how to obtain this information, I'm only going by what It says in my Motherboard manual.

Heres another source which I followed a tutorial on how to obtain some information about my display.

System Information
------------------
Time of this report: 7/14/2012, 14:42:31
Machine name: MIKEG
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 11/22/10 10:42:51 Ver: 08.00.14
Processor: Pentium® Dual-Core CPU E5800 @ 3.20GHz (2 CPUs), ~3.2GHz
Memory: 8192MB RAM
Available OS Memory: 8158MB RAM
Page File: 2949MB used, 13362MB available
Windows Dir: C:\windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: 96 DPI (100 percent)
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode


Someone please help me.

EDIT: My expansion slots consist of

1 x PCIe x16 Slot.
1 x PCIe x1 slot (optional)
2 x PCI Slots.

and my power supply can hold AC 230 V.