[SOLVED] 4-bit desktop Problem

[Redman]

Hello.

I reinstalled Windows XP and i have a problem. I have "640x480" and "4 bit (lowest)" settings in display settings. I can't change it. Tremulous says "Warning: low desktop color depth" and when i press "OK" it says "cannot load OpenGL". nVidia Control Panel don't open. When i click nothing happens.
 
I have:

-latest GFX card drivers,
-latest OpenGL DLL,
-motherboard drivers,
-March 2008 DirectX,

My computer:
CPU:        AMD Athlon XP +2200 (1808MHz)
GFX Card: nVidia GeForce 7800GS (256MB RAM)
RAM:        512MB DDR RAM
OS:          Windows XP

Everything was working on these drivers and DLLs before reinstallation.

Please help! I can't play best game on the world... (Tremulous )

@EDIT

I can play Quake 1 and Quake 2!!!!!
Other games says "invalid bits per pixel" or something like that.
OpenGL works.

[Bomb]

Try a complete hard drive erase, then reinstall.

[Redman]

Ok, i try.

[Bissig]

When you can't change the resolution in your gfx drivers settings, that gfx driver is not or not properly installed.

[Bomb]

It could also be a hardware problem. Redman, have you dropped your computer recently?

[Bissig]

Hello.

I reinstalled Windows XP and i have a problem. I have "640x480" and "4 bit (lowest)" settings in display settings. I can't change it. Tremulous says "Warning: low desktop color depth" and when i press "OK" it says "cannot load OpenGL". nVidia Control Panel don't open. When i click nothing happens.
 
--- snip ---

This clearly says that his nvidia drivers are NOT installed.

[Redman]

XP reinstalled.

I see something WTFed. I can change resolution to my favorite (1280x1024) WITHOUT installed drivers. I think previous Windows installation was really fu****. Now I install the drivers.

@EDIT (2008-07-19 12:36)

Everything working, every game working

Thanks for help.