I bought the Sapphire HD 3850 thinking it would help, but it made things worse. (I couldn't even run TF2 w/everything on low)
Here are my specs now:
Windows XP Pro
Pentium 4 2.8GHz
2.75 GB RAM
NVIDIA GeForce Ti 4200 with AGP8X (64 MB) 
250 GB HD, 232 GB free
I still have the Sapphire card waiting to be returned, so I need to know what to exchange it for. My only guess is my CPU can't handle the power of the GPU. Let me know, thanks.
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System Information
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Time of this report: 6/23/2008, 18:02:30
Machine name: REAL-C1EE79514B
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_qfe.071023-1323)
Language: English (Regional Setting: English)
System Manufacturer: GBT___
System Model: AWRDACPI
BIOS: Award Modular BIOS v6.00PG
Processor: Intel(R) Pentium(R) 4 CPU 2.80GHz (2 CPUs)
Memory: 2816MB RAM
Page File: 713MB used, 3994MB 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
------------
DxDiag Notes
------------
DirectX Files Tab: No problems found.
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.
--------------------
DirectX Debug Levels
--------------------
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)
---------------
Display Devices
---------------
Card name: NVIDIA GeForce4 Ti 4200 with AGP8X
Manufacturer: NVIDIA
Chip type: GeForce4 Ti 4200 with AGP8X
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0281&SUBSYS_00000000&REV_A1
Display Memory: 64.0 MB
Current Mode: 1024 x 768 (32 bit) (60Hz)
Monitor: SONY GDM-400PS/400PST/19PS
Monitor Max Res: 1600,1200
Driver Name: nv4_disp.dll
Driver Version: 6.14.0010.9371 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 10/22/2006 12:22:00, 4527488 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
&