Actually the process is quite simple. First of all go to download.live.com, and download the software (you can download it in your language as well, by clicking on the Download button to the right.

After you have downloaded the software, open it. There will be a loading window at first. Wait a little, this may take some time especially on slow computers.

Now a new window must have opened with  a list of softwares that you can install. Check the software that you want to install, in our case Movie Maker, and then just press the Install button.

Well now all you got to do is wait. Go grab a cup of coffee while the softwares are downloaded.

After the download is complete, you may be asked to reboot. Do so, and there you are, you’ve got Windows Movie Maker installed in Windows 7!

Tip: If you want to install any other application (for eg. Live Writer) just open the software that you downloaded at the first step, and check the software that you want. Just follow the above steps.

If you want to uninstall it, you can do so by going to Control Panel -> Programs -> Uninstall a Program, and in the new window that opens, scroll down to Windows Live Essentials. Double Click on it and click Continue.