I missed one from the response above:
REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Extensions\{31D09BA0-12F5-4CCE-BE8A-2923E76605DA}"
Also want to point out that all Manage Add-ons are not the same and some can be removed like regular programs/software and some sites say just delete the dll and such.
Hope this all helps.