I can not down load any thing why can you help

You might have a virus.

You might need a anti-virus software like AVG, Kaspersky or Avira might help :)

Hmm have you tried downloading files from more than one website?

What are you trying to download? What happens when you try to download?

There is too little info here to even suggest a virus issue. For us to help you need to be more detailed.