Where did you move it to?
The way I would recommend you move a libray is to move the entire iTunes folder from its usual starting place of <User's Music>\iTunes to X:\iTunes where X: is the drive you want the library to live on. You then hold down shift as you start iTunes and keep holding until asked to choose or create a library. Click choose and browse to X:\iTunes\iTunes Library.itl.
If you've already moved the media folder there is no reason why you can't move the iTunes folder as suggested, move the media folder inside it, and then shift start iTunes. It should fix the problem.
tt2