Disconnect: Kicked by Console : zBlock - "mat_dxlevel" value "0.00" below acceptable limit: to play on this server set the value to at least "80.00".

Disconnect: Kicked by Console : zBlock - "mat_dxlevel" value "0.00" below acceptable limit: to play on this server set the value to at least "80.00".
This error occurs in counter strike source..

This happens because you have set the game to run at too low a DirectX level, which is classed as an exploit, and will get you kicked from some servers.

To fix it, write 'mat_dxlevel 80' into the game's console to set it to run at DirectX 9.

Note: Writing this may freeze your game (very less chances) so at that time you have to create an autoexec.cfg...
I hope this will help you...