A few days ago I tried changing the name of the middle file in the top row (Currently "iTunes Lib", which is what I think it was originally). I opened iTunes last night and found that none of my music was there. Obviously iTunes is looking for THAT folder, but the name is different.
What can I do to set this right? If I knew the original name of the file, I would try that. Thanks for your help.

What can I do to set this right? If I knew the original name of the file, I would try that. Thanks for your help.