Team Fortress 2 Gun Glitch?

There's a problem with the visual aspect of my tf2. I just opened the game and in the tutorial of the soldier class the guns don't have the proper skin, or any for that matter. i can see them, but they're strange dark polygons generally shaped like guns, but then the shape moves all the way to the cross-hair and when i turn it moves across my screen, blinding me. any help would be appreciated. (I already tried re downloading it)