It is not possible to download youtube! Please help!

Hello, I have a fat 360 console , after logging in to xbox live in the market not showing apps, they can not be downloaded, if you exit Kaunda apps appear but when I try to download them falls error. The YouTube doesn't have a button to run, and only view information , otsenite application and attach to the home page. To run it not as( Polu4aetsa that my console does not support apps? The same can't be asking for help. It is possible that something is wrong with acondom?