When I connect my ipad2 to my computer it says there is new version of my ipad software. I have 4.3.3 it is trying to install 4.3.5. I have done this three times the same error pops up. "There was a problem downloading the software for the Ipad. The network connection has timed out. I thought maybe my Itunes should be on the ipad2 so I did same error. What is the problem?