Remove Animations from Part of Model

Hello, I'm new into Unity. I have a problem with animations. I bought an character model with animations. I would like to make FPS multiplayer game. I'm using "Animation" component to animate the character. Not "Mecanim" because I couldn't find advanced mecanim tutorial, only movement and jump. So I decided to use "Animations" component. Today I have recognized that two arms (Left and Right arms) animates when Model aims and runs. I want to disable this arm animations when the character model aims and runs. Character Model has "Stand_Aim", Run_Forward_Aim, Run_Backward_Aim etc animation clips. If my character aims and runs than his both arms also animates. If arms animates than I have to also animate the weapons? I don't want to animate the weapons and arms when the character Aims and Runs. Is it possible? If I'll use Mecanim Animation System can I do that? If yes please help me. Thanks in advance

 

Maybe this can help:
http://docs.unity3d.com/Documentation/ScriptReference/AnimationState.AddMixingTransform.html

 

Thank you aniv. I hope