So, just some things to verify...
On both computers, you have downloaded the most current version of iTunes.
You have to sign in to iTunes on both computers with the SAME Apple ID.
Once you do that, you have to "Authorize" both computers.
To get the drop down menus in iTunes for Windows, click the box in the upper left corner of the iTunes screen and select "Show Menu Bar".
Check that info and GL!!! I just setup my computer and iPhone following http://support.apple.com/kb/HT4557
Worked like a champ...GL!! again...