Well, you should be using the computer that is registered to your iPad; also you'll need iTunes updated to version 10.5 - your iPad will be 'backed up' on the computer and once iOS 5 is installed, your iPad should be restored to its original state on the new OS, including your music. If you have more specific needs, questions, or are trying to use a computer different from one that you originally registered your iPad, then please respond before a potential problem occurs! Good luck -
Thanks, I deleted my music etc from the computer thinking I would not need it again, my daughter uses it now and her music is on it, although I can still log un under my name.