This could be many things. You'll want to first start by using the developer tools with your browser and find out what errors your page is showing. From there you can start to make fixes.
First issue I find is the server is not set to allow the proper MIME types. In this case, your fonts might not load, specifically the
You'll want to check disk permissions to ensure the user running the application pool has at least read access to the website root directory.
Are you sure you copied all the files? There's a good chance some may have been missed or not copied properly.
Where are your design files (images, css, js, etc.) located? Do they have absolute URL paths referenced or are they relative?