Vista uses a new file structure so the VBScript to install iTunes should be modified. Any %SystemDrive%\Documents and Settings\%Username%\ in XP is now %SystemDrive%\Users\%Username%
New iTunes 7.4.1 adds HKCU entries for Outlook Add-in. If you don't want the package to run a self heal on this feature move the HKCU items to the HKU\.DEFAULT hive. This will create the HKCU items for any new users that log onto the machine or that do not have the HKCU iTunes hive items in their profile.
Just a quick note regarding Vista. Although the user profile is in a different location, the %userprofile% environment variable still works and can be used.
Follow below link to package latest version of itunes for Windows 7
View inventory records anonymously contributed by opt-in users of the K1000 Systems Management Appliance.