My 10-year-old PC finally died and I got another with Itunes 5.3.3 installed. Previously, was able to hookup my Ipad (4.2.1) with no problem, and I wanted to do that right away and take a backup of the Ipad. This time, however, I get the message: "This ipad cannot be used because Apple Mobile Device service is not started". I click "OK" (there's no other option), the message is redisplayed 1 more time and that's it - nothing happens, not a word of explanation about what to do next. Can the Forum help, please?