Whenever I select to manually manage music and videos, I get an error message that says "
The iPhone is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library?"
I haven't connected my iPhone to any other computer, the one I am using now is the original it was connected to (Windows PC), why is this message appearing? The only reason I can think of that it thinks it is a new iTunes library is that I updated to iTunes 11 recently. Is there anything I can do to fix this without erasing my iPhone?