I am becoming exasperated. I get the message that 'some apps could not be synced because my phone is synced with another iPhone library'. I don't know how: I've always only ever synced on the same PC. As it is, I am having to repurchase apps. If I deauthorise the PC and then uninstall and reinstall iTunes, will this remove all libraries? Will I then be able to sync afresh and get all my apps back? This only affects some of the apps I purchased through my iPhone. Any good advice will be much appreciated.