Q: airport utility can't be installed...! Help!!!

Hi,  I just installed the airport utility disk to install soft wear and I can't go any further as it says the OS X isn't supported on this volume...?  Do I need a different utility install disk?  Thanks for help.

P.S.  Im trying to play itunes from my mac book pro through bose 321 surround.  This is the reason for the airport express.

Tim