If you google alternatives to windows movie maker, there are a few lists which discuss what is good/bad about each. 'Easy to use' is quite subjective so it's probably best that you look through them yourself.
OK, google 'free alternatives to windows movie maker' then. They are out there and not very difficult to find.
I use Filmora. Its free and easy, just go to their official website. When you finished installing it, register. Because if you're unregister, you're video will had a gigantic Filmora watermark. Watch on Youtube on how to register.