Technical assistance, please urgent:

Very good day , I have a technical problem that does not affect the truth if I ignore it as such .
But it is quite annoying , could not and as they play Battleground because I see the textures of players in black ( Only the players everything else is perfect to me ) And I lower the fps to 3, the game runs me up and even put it in under me going to the same 3 fps for that problem or bug , I thought it might be graphics card problem but I think that all is well , or at least believe that. Could it be a failure file a corrupt file or something ? Because the Druids when they are turned into wolves or other monsters do not give me no lag and textures only happens when I'm around ( only when I see it ) of a game, please help master the game but now to be 85 I want to look something with my friends and I can not for the simple fact of not bothering with my lag.