Counter Strike 1.6 help

Can any1 help me about my problem with cs 1.6? ever since i did a windows restart on my computer it doesnt let me go into OpenGL renderer mode but instead says:The specified video mode is not supported.The game will now run in software mode. And while it says that other programs like google earth and few online games using OpenGL as renderer dont crash.

If any1 has any idea how to fix this then can you please tell me?

Wild shot: install drivers for your graphics card. Without drivers, you get software accelerated OpenGL 1.1 which is not enough for this game.