can not download games from the Internet don't know why?

Answer 1

What games do you want to download from where?

Answer 2

It's possible that you have a firewall up that's blocking incoming info.
Or you may have security software running that is also blocking the download process.
You can manually configure either of these to allow downloading from the web.

Without more information it's hard to say exactly what it is you need to do. But check your security settings first.