Shoutbox

The suggestions above won't work for most users, because most users have to restart either Messenger or their computers, occasionally.  If you delete/rename the registry key, Messenger throws an error when starting up.  If you delete/rename the file, the MSI repair puts it back.  So there's no winning either way.

To solve the problem, use the Group Policy editor (gpedit.msc) to create a Software Restriction Policy that Disallows the "C:\Program Files\MSN Messenger\livecall.exe" program in the Local Computer Policy.  That way, both the registry key for the MSI repair and the program files can exist, but livecall.exe simply isn't allowed to execute.

You can use the same method to disallow other pesky programs that are pernicious enough to re-assert themselves in spite of your best efforts to delete/rename them.

I really wish that Microsoft would make LiveCall an option that could be toggled on or off.  That would've been the polite/smart thing to do...