Greetings, the Wise Care 365 3.9.5 uninstaller leaves at least these registry keys:
HKEY_CLASSES_ROOT\*\shell\WShredFile
HKEY_CLASSES_ROOT\Folder\shell\WShredFile
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\*\shell\WShredFile
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\WShredFile
because of this, if you right-click on a file in the desktop, you still can read the "destroy file/folder" option (please note that I translated "destroy file/folder" from italian), even if the program is uninstalled.
My operating system is Windows XP service pack 3 italian.
I tried the "Giveaway of the Day" 3.9.5 version.
I tried to make the application portable before uninstalling.
A reboot did not help.
Regards.