I just installed an ATI Radeon 9550 Video card and its been crashing so much with my games. I get 30 seconds into each game and the screen goes black and the monitor goes to sleep, then i have to restart my computer. can you please help :[ Ill put some info from my dxdiag
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System Information
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Time of this report: 1/10/2009, 14:22:22
Machine name: MONTIEL
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.080814-1233)
Language: English (Regional Setting: English)
System Manufacturer: HP Pavilion 061
System Model: PJ509AA-ABA A720N
BIOS: Rev. 3.10
Processor: AMD Athlon(tm) XP 3200+, MMX, 3DNow, ~2.2GHz
Memory: 1024MB RAM
Page File: 496MB used, 1029MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode

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DxDiag Notes
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DirectX Files Tab: No problems found.
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.

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DirectX Debug Levels
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Direct3D: 0/4 (n/a)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

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Display Devices
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Card name: ATI Radeon 9550 / X1050 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI Radeon Graphics Processor AGP (0x4153)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_4153&SUBSYS_04021002&REV_00
Display Memory: 256.0 MB
Current Mode: 1440 x 900 (32 bit) (60Hz)
Monitor: Plug and Play Monitor
Monitor Max Res: 1600,1200
Driver Name: ati2dvag.dll
Driver Version: 6.14.0010.6891 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 12/1/2008 15:51:31, 318464 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: ati2mtag.sys
Mini VDD Date: 12/1/2008 17:13:40, 3452928 bytes
Device Identifier: {D7B71EE2-0213-11CF-5969-0824A1C2CB35}
Vendor ID: 0x1002
Device ID: 0x4153
SubSys ID: 0x04021002
Revision ID: 0x0000
Revision ID: 0x0000
Video Accel:
Deinterlace Caps: n/a
Registry: OK
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Not Available
DDraw Test Result: Not run
D3D7 Test Result: Not run
D3D8 Test Result: Not run
D3D9 Test Result: Not run

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Go ahead and update XP to Service Pace 3 and where did you get the video drivers from? If off a supplied CD go to AMD/ATI's support website and download the latest XP Catalyst and video driver from there

2 questions, what drivers are you using, and how long have you had your monitor?

Ignore the fools who say forget about installing Service Pack 3 on any XP machine. If you encounter any problems after installing Service Pack 3, it could mean that your computer needs serious servicing because of hardware problems or malware infections

You need to up the AGP voltage to 1.9v in the BIOS or it will freeze and crash. I had to do it too, it's a horrible generic graphics card. My advice, next time don't skimp on a video card. I'm sure not going to.