When using some custom shaders my computer hangs
Any way to prevent this?

I can only offer general advice here:
- Turn off some of the graphics options (reflections, etc)
- Update graphics drivers, can sometimes lead to extra efficiency/support

What specific graphics card model are you using, and how fast is your computer's CPU(/quantity of RAM, general dxdiag-gatherable stuff, really).

How do I know those?

To know about your computers system do this steps .

1.Start menu
2. Run...
3. Write in " dxdiag " (without ")


There you will see about your computer.
Now you can answer to 3vi1 question.

------------------
System Information
------------------
Time of this report: 4/23/2009, 17:05:25
Machine name: HANZ
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.090206-1233)
Language: English (Regional Setting: English)
System Manufacturer: Unknow
System Model: Unknow
BIOS: )Phoenix - Award WorkstationBIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 5200+, MMX, 3DNow (2 CPUs), ~2.6GHz
Memory: 1022MB RAM
Page File: 657MB used, 1803MB available
Windows Dir: CWINDOWS
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.
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 GeForce 8500 GT
Manufacturer: NVIDIA
Chip type: GeForce 8500 GT
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0421&SUBSYS_00000000&REV_A1
Display Memory: 512.0 MB
Current Mode: 1280 x 1024 (32 bit) (60Hz)
Monitor: Default Monitor
Monitor Max Res:
Driver Name: nv4_disp.dll
Driver Version: 6.14.0011.6371 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 9/17/2007 01:07:00, 5783040 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: nv4_mini.sys
Mini VDD Date: 9/17/2007 01:07:00, 6853088 bytes
Device Identifier: {D7B71E3E-4761-11CF-537B-0B2000C2CB35}
Vendor ID: 0x10DE
Device ID: 0x0421
SubSys ID: 0x00000000
Revision ID: 0x00A1
Revision ID: 0x00A1
Video Accel: ModeMPEG2_C ModeMPEG2_D ModeWMV9_B ModeWMV9_A
Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
Registry: OK
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled
DDraw Test Result: Not run
D3D7 Test Result: Not run
D3D8 Test Result: Not run
D3D9 Test Result: Not run

-------------
Sound Devices
-------------
Description: Realtek HD Audio output
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0862&SUBSYS_0880E601& REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RtkHDAud.sys
Driver Version: 5.10.0000.5477 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 9/5/2007 17:31:30, 4611072 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Full
Cap Flags: 0xF5F
Min/Max Sample Rate: 8000, 192000
Static/Strm HW Mix Bufs: 33, 32
Static/Strm HW 3D Bufs: 33, 32
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: Yes, Yes
I3DL2(tm) Listen/Src: Yes, Yes
Sensaura(tm) ZoomFX(tm): No
Registry: OK
Sound Test Result: Not run

---------------------
Sound Capture Devices
---------------------
Description: Realtek HD Audio Input
Default Sound Capture: Yes
Default Voice Capture: Yes
Driver Name: RtkHDAud.sys
Driver Version: 5.10.0000.5477 (English)
Driver Attributes: Final Retail
Date and Size: 9/5/2007 17:31:30, 4611072 bytes
Cap Flags: 0x41
Format Flags: 0xFFF

-----------
DirectMusic
-----------
DLS Path: CWINDOWS\SYSTEM32\drivers\GM.DLS
DLS Version: 1.00.0016.0002
Acceleration: n/a
Ports: Microsoft Synthesizer, Software (Not Kernel Mode), Output, DLS, Internal, Default Port
Microsoft MIDI Mapper [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal
Microsoft GS Wavetable SW Synth [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal
Registry: OK
Test Result: Not run

-------------------
DirectInput Devices
-------------------
Device Name: Mouse
Attached: 1
Controller ID: n/a
Vendor/Product ID: n/a
FF Driver: n/a

Device Name: Keyboard
Attached: 1
Controller ID: n/a
Vendor/Product ID: n/a
FF Driver: n/a

Poll w/ Interrupt: No
Registry: OK

-----------
USB Devices
-----------
+ USB Root Hub
| Vendor/Product ID: 0x10DE, 0x03F1
| Matching Device ID: usb\root_hub
| Service: usbhub
| Driver: usbhub.sys, 2/28/2006 20:00:00, 57600 bytes
| Driver: usbd.sys, 2/28/2006 20:00:00, 4736 bytes
|
+-+ USB Human Interface Device
| | Vendor/Product ID: 0x0458, 0x003A
| | Location: Optical Mouse
| | Matching Device ID: usb\class_03&subclass_01
| | Service: HidUsb
| | Driver: hidclass.sys, 2/28/2006 20:00:00, 36224 bytes
| | Driver: hidparse.sys, 2/28/2006 20:00:00, 24960 bytes
| | Driver: hid.dll, 2/28/2006 20:00:00, 20992 bytes
| | Driver: hidusb.sys, 8/17/2001 14:02:20, 9600 bytes
| |
| +-+ HID-compliant mouse
| | | Vendor/Product ID: 0x0458, 0x003A
| | | Matching Device ID: hid_device_system_mouse
| | | Service: mouhid
| | | Driver: mouclass.sys, 2/28/2006 20:00:00, 23040 bytes
| | | Driver: mouhid.sys, 8/17/2001 13:48:00, 12160 bytes

This should help you out to update your Gfx Driver : http://www.nvidia.com/object/winxp_182.50_whql.html

K. Dl ing now


EDIT: It worked. Thank you!