I am using the released version of Windows 10, upgraded from the Beta version.  My machine originally had Windows 8.1 installed.

I removed windows live mail using the control panel and remove portion of windows essentials.  This took the program and Icon off of my start page.

I then went to REGEDIT HKEY_CURRENT_USER/SOFTWARE/Windows Mail and right clicked.  When I chose delete I got a are you sure notification, clicked yes and then got an "Error Deleting Key,   Cannot delet Windows Mail: Error while deleting key.

I tried the same thing in HKEY_LOCAL_MACHINE with the same results. 

Where did I go wrong?