Hi Steve,

I hope everything went allright with the kid's tooth 🙂

I have to agree with Joshua Perry on the new version of the question. All answer possibilities involve detaching and attaching - and whereas it IS possible to move a system database in that way, and I did indeed post a link to an MSKB article describing some gotchas with that approach, there is a far easier way documented in Books Online:

1) ALTER DATABASE to modify the files for msdb;

2) Shutdown the server;

3) Physically move the database files;

4) Restart the server;

5) Check that all has gone right.