Chris Stegner wrote:
but I should be able to play my music on any of my computers, right?
Not when involves the iphone. By design, the iphone will sync itunes content with ONE computer at a time. Any attempt to sync such content with a second computer will result in ALL itunes content being first erased from your phone & then replaced with the content from the second computer.
What you could do is this:
1. First disable auto sync when an ipod/iphone is connected in itunes, under preferences, which in Windows is under the edit menu.
2. Connect your phone, itunes running, DO NOT SYNC!
3. Go up to Store>Authorize this Computer.
4. Next, File>Transfer Purchases your purchased content will be transferred, music you ripped on your own won't.
You should be able to play your music now.