Missing mp3 files in Media Center

I am running Windows 7 Pro on a Dell T3400. My question concerns Media Center

I have a bunch of mp3 files I renamed. Now Media Center cannot find the files. The files are on an external usb drive.

I tried moving the renamed files to a different directory and then adding that new directory to Media Center. This did not help.

I'd like to learn how Media Center indexes files and how to manipulate the index. Also I understand mp3 files have tags on them to hold information.

q1.) How do you manipulate the Media Center file index?

q2.) What would you do to force Media Center to find the missing mp3 files?

q3.) Where can I find more information on how tags work in mp3 files?

Thank you for your help.

The problem is user error (me). This has been solved.