How can I configure the right-click menu in Windows 7?

The registry entries you should specifically look at are:

HKEY_CLASSES_ROOT\*\shell (for specific file types)
HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers (also for specific file types)
HKEY_CLASSES_ROOT\AllFileSystemObjects\ShellEx (for all context menus)
HKEY_CLASSES_ROOT\Directory\shell (for folders)
HKEY_CLASSES_ROOT\Directory\shellex\ContextMenuHandlers (also for folders)

Remember to always backup your registry before editing it by going to File > Export... in the regedit.exe application.

Or if you prefer to do it using an application (which apparently you don't but I'll put it in here anyway):

You can use ShellExView and ShellMenuView to see a list of all current (and past, as long as the entries have not been removed) context menu items and disable or enable them from there.

Source: How-To Geek

If you like to play with REGEDIT ;

Run regedit and navigate to

HKEY_CLASSES_ROOT*\shellex\ContextMenuHandlers

Here you need to simply delete the keys you don't want.For more see this.

But I would prefer small but functional softwares to do this ;

Alternatively you can use an application to edit the items in the context menu.

ContextEdit is a good freeware you may want to use. You can also try ShellMenuView. It is a small utility that displays the list of static menu items that appeared in the context menu when you right-click a file/folder on Windows Explorer, and allows you to easily disable unwanted menu items.

FileMenu Tools lets you add, delete & customize the context menu items of the Windows Explorer.

It lets configure the following aspects:

• Add some build-in utilities in order to do operations over files and folders.
• Add customized commands which let run external applications, copy/move to a specific folder or delete specific file types.
• Configure the "Sends to..." submenu.
• Enable/disable the commands which are added by other applications to the context menu and much more !