The newest version of iTunes will only work on XP or Vitsa, you'll have to either upgrade your operating system to XP or download an older version that is compatible with your operating system, try this website for older versions on iTunes http://www.oldversion.com/program.php?n=itunes
Two Options
The newest version of iTunes will only work on XP or Vitsa, you'll have to either upgrade your operating system to XP or download an older version that is compatible with your operating system, try this website for older versions on iTunes http://www.oldversion.com/program.php?n=itunes