How do I restore missing itunes links by changing the drive letter?

Question

Bought a new Windows 8 PC and moved my old XP MyMusic folder to the Win 8 Music folder.  Installed iTunes and it automatically found the music and all the music files managed by iTunes in the iTunes sub-folder work just fine.  The problem is I have many other music folders under the top level Music folder and the links to those files are broken.  They are broken because on the old PC everything was on the D drive but now they are on the C drive.
If I "Get Info" on a track I can see it is still looking for the file on the D drive.  I'd like to do a mass edit to change all the references to the D: drive to be C:.  I've been unable to find a program that will do this.  Or, is there another way?
An option might be to somehow reorganize the folder structure on the old PC and then re-copy the folders to the new PC.  I do not want to put everything into iTunes folders because that would duplicate everything and make them hard to find.  I often get content outside of iTunes, such as by recording LP's.

Answer 1

I'll try to double check the mechanism. There is certainly part that compares file sizes to try to ensure the correct match. If your effective media folder is the Music folder above iTunes instead of iTunes Media inside it is there is a chance that files were named by Windows Media Player in the past rather than iTunes? iTunes has different substitutions for invalid characters and limits file & folder names to 40 characters. Have you got any deeper folder nesting than <Media Folder>\<[Album ]Artist>\<Album>?
This thread shows the list of potential folders that the script will look through. In most cases there will only be a few folders from that list that match any given combination of artist, album artist and album, and in those folders even fewer files that match with the track number and name, and, in most cases, only one that has also has the correct file size.
It would be useful to have the details of a sample track that the script is failing to locate, its true location and what iTunes shows on the Get Info > Summary tab.
tt2