i got a file for ios 7 thru a friend to upload onto my iphone 5. the file was for a windows computer so i could not upload it on my macbook which has the itunes that i sync my iphone with. i ended up using my brother in laws windows computer to load ios 7 and everything worked perfectly. however, whe i try to sync my phone on my macbook it wont allow me to sync( it either cancels the sync itself or it freezes). i cannot add any apps or even music. how do i alleviate this problem? and will it force me to restore my iphone from my computer and lose ios 7?