Q: Where do I find the Bonjour service I need for home sharing from a Windows 7 desktop?

No joy with ITunes but did make progress with home sharing

I have version 12.1.3.6 on a XP laptop that seems to work fine and recognizes my mobile devices.

What kind of problems will I have if I load that version instead of the latest 12.4.2.4 ?

I did get a message "an iphone has been detected but could not be identified properly" then iTunes became unresponsive and I had to use task manager to clear the screen.

Other thoughts.  My system is 64 bit but with various 32 bit applications.  Would that make a difference to iTunes?

What about iCloud? Is the latest version of iTunes expecting to have access to iCloud?

I've tried two older installs and both came up with install error "could not open key".  These two, unlike the current version, rolled back and quit.

The key is "UNKNOWN\Components\ (+63 alphanumeric characters)  What is this all about and how do I deal with it ?

Let's give a shout out to New Zealand.  Problem solved