On second computer, ITunes doesn't show songs on IPhone

Question

Having dowloaded ITunes on new Vista pc, when hooking up IPhone, ITunes recognizes my acct and the memory taken up by music but doesn't show any of the several hundred songs on IPhone
HELP!

Answer 1

Before reformatting your computer's hard drive or reinstalling Windows - this is important because you will probably be reinstalling Windows again in the not too distant future, you can back up your entire iTunes library - it is in a single iTunes named folder. This will include playlists, playcount, etc.
Have you reauthorized your computer with your iTunes account with iTunes?
iTunes includes an option to transfer iTunes content from an iPod or iPhone that was purchased from the iTunes store, but this is for iTunes content that was purchased from the iTunes store only. After you have reauthorized your computer with your iTunes account with iTunes, with your iPhone connected and without syncing, at the iTunes menu bar go to File and select Transfer Purchases From - the name of your iPhone.
If any 3rd party apps do not transfer to your iTunes library, you can re-download purchased apps and you won't be charged again as long as you use the same iTunes account that was used to purchase the app originally.
An iPod supports disk mode, so the iPhone not supporting disk mode has nothing to do with DRM. Security and "whatnot" is important. As a Windows user with constant virus, adware, and spyware concerns, you should welcome a company that takes security seriously and does something about it. I guess after suffering with Windows for so long getting used to constant security concerns and "whatnot", I guess Apple shouldn't be so concerned about security making Windows users feel more at home giving you the ability to use the device any way you want and the same for hackers and script kiddies? Sorry, but you can stick with Windows and Windows Mobile for that.