System
AMD Anthlon XP 1600+ 1.40 GHz with 768mb of ram
Windows XP Professional
3dfx voodoo3

Im having Problems playing Wolfenstien: Enemy territory when the game starts the screen flickers then i get this messege. If you got any ideas let me know, email me at killerhurts01@hotmail.com

ET 2.55 win-x86 May 27 2003
----- FS_Startup -----
Current search path:
C:\PROGRA~1\WOLFEN~1\etmain\pak0.pk3 (3725 files)
C:\PROGRA~1\WOLFEN~1\etmain\mp_bin.pk3 (4 files)
C:\PROGRA~1\WOLFEN~1/etmain

----------------------
3729 files in pk3 files
execing default.cfg
couldn't exec language.cfg
couldn't exec autoexec.cfg
Hunk_Clear: reset the hunk ok
...detecting CPU, found AMD w/ 3DNow!
Bypassing CD checks
----- Client Initialization -----
----- Initializing Renderer ----
-------------------------------
----- Client Initialization Complete -----
----- R_Init -----
Initializing OpenGL subsystem
...initializing QGL
...calling LoadLibrary( 'C:\WINDOWS\system32\opengl32.dll' ): succeeded
...setting mode 4: 800 600 FS
...using desktop display depth of 32
...calling CDS: ok
...registered window class
...created window@0,0 (800x600)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 32, 24, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...GLW_ChoosePFD( 32, 24, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...failed to find an appropriate PIXELFORMAT
...restoring display settings
...WARNING: could not set the given mode (4)
...setting mode 4: 800 600 FS
...using colorsbits of 16
...calling CDS: ok
...created window@0,0 (800x600)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 16, 16, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...GLW_ChoosePFD( 16, 16, 0 )
...35 PFDs found
...GLW_ChoosePFD failed
...failed to find an appropriate PIXELFORMAT
...restoring display settings
...WARNING: could not set the given mode (3)
...shutting down QGL
...unloading OpenGL DLL
...assuming '3dfxvgl' is a standalone driver
...initializing QGL
...WARNING: missing Glide installation, assuming no 3Dfx available
...shutting down QGL
----- CL_Shutdown -----
RE_Shutdown( 1 )
-----------------------
GLW_StartOpenGL() - could not load OpenGL subsystem

what version, and how do i use it?

Okay i did it, but now it pops up with a box labeled ERROR
hwcinit: 3dfx device not found

clicky
you can try mesafx as well (do the same thing,but use mesafx instead of wickedgl)

dont forget your voodoo3 driver must be correctly installed before you do anything else.