Guys please , i put the mods folder within the folder m2demos, and also in the primary folder C://MODERNWAFARE2/MODS and they do not rotate or by placing the command set ( +fs_game mods/nomedomod) in the executable or giving the direct command in the console, what should i do to work?

You need to place that "mods" folder on the root of your modern warfare 2 (it's useless to have it in "m2demo").

Then you need a folder for each mod, inside that "mods" folder. Inside each specific mod folder, you got the iwd files for the mods.

Then, you make fs_game mods/(that mod's folder name)

( +fs_game mods/nomedomod)

Seems that you speak portuguese... there's a portuguese section here on the forum:

viewforum.php?f=26

case solved, close the topic