If my computer has a virus can my iPhone have one?

IPhone ios 5 lost apps after backup? Multiple devices one computer.?

• I recently upgraded my girlfriends iPhone 4 to I0S 5 the phone hadn't been backed up for ages and since the last time it was done the computer used has been formatted/restarted so had no memory of the iPhone. Before performing the upgrade I backed the phone up and have found the file stored on the computer so know it was successful. The problem is that none of the apps were restored following the upgrade and the only apps that appear to sync post upgrade are from my iPhone 4s and iPad 2. Both of these devices have been backed up/synced after the Computer was reformatted and before my girlfriends iPhone so are familiar to the computer. Ideally I want the phone to have all it's original content and remain on IOs5 5. What are my options to resolve this problem? I'm paranoid I'll just lose everything through some failed restore or confusion from the other devices content. Many thanks Steve

• Answer:

  You should "Transfer Purchase" prior to performing upgrade.