You've off topic for this forum, however the following will answer your question:
http://www.zune.net/en-us/support/usersguide/gettingstarted/pcreqs.htm
Either 32-bit or 64-bit versions of Microsoft® Windows Vista® Home Basic, Windows Vista Home Premium, Windows Vista Business, Windows Vista Enterprise, Windows Vista Ultimate, or Windows Vista Starter Edition; 32-bit versions of Windows XP Home Edition Service Pack 2 (SP2), Windows XP Professional SP2, Windows XP Tablet PC Edition SP2, or Windows XP Media Center Edition 2005 with KB900325 (Rollup Update 2 for Windows XP Media Center Edition 2005); Mac OSX with BootCamp (running either Windows Vista or Windows XP).
In addition, go to Windows Update and install any high-priority updates that are available for your computer.
Zune software won't run on versions of Windows earlier than Windows XP SP2, any 64-bit version of Windows XP, or any version of Windows Server.
-steve
