"Moving iTunes" can mean 3 things:
1. You moved the program from c:\Program Files to your external drive.
2. You moved the library from your Windows profile to your external drive.
3. You moved the media (mp3's, movies, etc) from whereever they are to your external drive.
- If you moved the program, the shortcut pointing to it will not work any more.
- If you moved the library, iTines - when run - will make a new one.
- If you moved the media, the library now points to files that no longer exist.
I suppose it's #3. Then the easiest thing to do is to rebuilt the library, I think, so it points to the new location of the files. But there might be more to it, especially if it's content you bought from Apple and is protected by DRM.
By the way, do you realise that external drivers are less reliable than internal drives? So the need to have a backup of all media that you dont want to lose in case something happens (like the drive fails, or stolen, or ransomware encrypts everything, or you delete a file accidentally) is even more pressing. Be sure to have 2 copies on different media; together with the original this makes three.
Kees
Because my Itunes is clogging up a load of memory on my PC, I have transfered the itunes file to my attached external Edrive. Not knowing to much about this I thought just changing the desktop icon to Edrive would work, but obviously it does not.
Any suggestions?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic