Thanks for the script but if I can make a suggestion.

Microsoft don't recommend that you remove the entire key for an application that is still installed. Instead, if you remove the string 'UninstallString' from inside that key it will still appear in Add/Remove Programs but it wont have an uninstall option. Possibly even remove the 'ModifyPath' string as well if it is there.

Also if you remove the entire key, it will no longer appear in your installed apps report.