Texture packs will not import after redownloading. They freeze up the game.

I re-downloaded the game after leaving the beta. Now on the retail version when I try to redownload my texture packs it freezes up the game during the installation processes. I own a lot of texture packs and can not use them.  The game downloads them then says importing. That is when it freezes. I have to exit out and re-start the game.