Collision not working properly

The laptop in the image is a .fbx file from a free website. The character is in th mid air when it steps on it .Is there any fix? Please help.

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Double click the laptop mesh in the content browser. In the StaticMeshEditor click on the collision icon in the toolbar.
This will show you the collision. You can chacnge it wtihin this editor.

Here is a tutorial how to set up collision meshes

Thanks It worked . I need another help >Can you guide me hoew to create an AI to control pedestrians and vehicles

plenty of good tutorials out there.

like this

EDIT: you should try yourself and make open another question to a specific AI problem if you enounter one.