Removing the Desktop Gadgets options
Gadgetarian is a handy little tool that lets you enjoy your Vista / 7 Gadgets on Windows 10.
As is said on its page, since Gadgetarian is not a separate program, you don’t have to uninstall anything, just as you don’t have to uninstall “copy” and “paste”. In case you don’t need your gadgets, don’t place them on the desktop! (I assume you already know that, if you want to uninstall one or more gadgets, you can open the Gadgets panel, right click on any gadget and select the “Uninstall” option.)
However, if for any reason you don’t want to have the “Gadgets” option available on the Desktop’s context menu, open the Registry Editor, navigate to HKEY_CLASSES_ROOT\DesktopBackground\Shell\ and delete the “Gadgets” key — or, open your Notepad and paste these lines:
Windows Registry Editor Version 5.00 [-HKEY_CLASSES_ROOT\DesktopBackground\Shell\Gadgets]
Save your file as WhateverName.reg and run it to delete the “Gadgets” key automatically.
If you want also to remove the “Desktop Gadgets” option from the Control Panel, press Win+R. In the dialogue that opens write gpedit.msc to open the Local Group Policy Editor.
Navigate to “User Configuration” > “Administrative Templates” > “Control Panel” > “Hide specified Control Panel items”. Check the “Enabled” option, press the “Show” button, and in the “List of disallowed Control Panel items” click on the first line to enter a new value. Write this name: Microsoft.DesktopGadgets
Press OK and close the Editor.