Can you post your dxdiag?
Windowsbutton -> run -> dxdiag
------------------
System Information
------------------
Time of this report: 9/5/2010, 01:18:34
Machine name: USERS-C3D0266DB
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 02/04/10 14:12:20 Ver: 08.00.14
Processor: AMD Phenom(tm) 9500 Quad-Core Processor, MMX, 3DNow (4 CPUs), ~2.2GHz
Memory: 2048MB RAM
Page File: 950MB used, 5022MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.5512 32bit Unicode
---------------
Display Devices
---------------
Card name: ATI Radeon HD 5700 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI Radeon Graphics Processor (0x68BE)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_68BE&SUBSYS_E144174B&REV_00
Display Memory: 512.0 MB
Current Mode: 1280 x 1024 (32 bit) (75Hz)
Monitor: Plug and Play Monitor
Monitor Max Res: 1600,1200
Driver Name: ati2dvag.dll
Driver Version: 6.14.0010.7111 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 8/4/2010 09:46:04, 300544 bytes