The missing menus at the top of iTunes (in recent versions) can indicate trouble with the Segoe UI fonts on your system. It's a new symptom of a problem that can also cause text to go missing from the Device tab in iTunes.
Unfortunately it's a bit trickier to deal with on Windows 7 systems than Vista or XP. (The "Vortical" instructions which can fix it for almost all folks on Vista and XP aren't applicable to Windows 7.)
Try having a look through the following (unfortunately very long) topic. It contains a lot of information on the Windows 7 variants of this, and possible methods for fixing the various Segoe UI-related issues that might be in play: