Noob questions about animator

After following all the tutorials and learning from the official learning projects i decided to start experimenting with the animator like in the http://unity3d.com/unity/animation tutorial.

So i got a set of animations from the net. Instantly i have two problems that i dont know what they are caused by and because of my lack of experience with Unity and 3d animation i have no clue to where to start searching.

Problems: 1. When i open the package with a model of a viking with lots of animations i can preview the animations in the inspector just like in the tutorial. But after trying to reproduce the steps learned in the tutorial and set up the model as a rig i can no longer see the animation previews. 2. I cannot drag in the animations into the animator state handler like in the tutorial. I dont know why. The mouse cursor shows a cross over icon and i cant get the animations into the animator.

Im not sure this is enough to get help, but please let me know what i else i need to state and i will do my best.