Set to the C:\ directory. (up to you to place it, but in the steps here, the files are extracted to C:\. This is a hack I downloaded, not DcOo CS1.6 server but it will serve its purpose as an example) Click OK then wait for the small progress window to dissapear. Go to the folder you extracted to.
Boxed folder is the folder containing the server files, should be "DcOo CS1.6 Server" (if you extract the whole folder)
Boxed item is "hlds.exe". Click it.
This is the settings window. Select your game (CZ or CS 1.6) , your server's name, map, maximum amount of players, and your rcon password (CAN BE USED TO BE A ADMIN IN THE GAME, BE CAREFUL WHO YOU GIVE IT TO)
Congratulations if you have this window after the loading! It should be ok if you see people joining. If you want to install AMX Mod X and don't know how to, click here