iTunes is like any other piece of software for finding the version number.
Help -> About iTunes
As far as not being able to drag and drop music, are you referring to adding files from your computer to the iTunes library or from your library to your iPhone / iPod?
It should not be an issue to add to the library from your computer by drag and drop, but you will need to check the box to manually manage your music, videos, etc on the main page of your device in iTunes, otherwise you will have to sync to add files.
Thank you for explaining how to display the menu bar. I didn't know this was possible. Honestly, I didn't even know there was a menu in the upper lefthand corner. So I guess the point is, let's not say things like "iTunes is like any other piece of software for finding the version number" because it's not like any piece of software I own. Most of the software I own just works and I don't have to mess with it.
Drag and drop into my library still doesn't work. When I drag an mp3 file over to the iTunes library I get a circle with a cross bar through it signifying (I assume) that it is not allowed. Of course, my prior assumption was incorrect, so maybe this assumption, too is incorrect, that the circle with a cross bar through it actually means that iTune will add the music at a later date.
I installed iTunes on my work laptop and, not suprisingly, drag-and-drop works here. So this is obviously not a user error and not a bigger software error, that there is some sort of problem with my installation at home, maybe a driver, maybe a setting. No one seems to have any answers so maybe I'll try calling Apple support tonight.
I solved it, at long last (and saved myself a potentially painful phone call to Apple support):
Per these instructions:
I performed a complete uninstall of all iTunes-related software.
I updated the driver for my NVidia 9400GT graphics adapter, rebooted.
I performed a clean install of iTunes (only difference, this time I chose the option to OPEN MUSIC FILES WITH ITUNES).
I now, two days later, have drag-and-drop capabilities.