its very simple
first, go into my computer, then to OS, and then into Windows
there should be a folder there called "System 32"
this is a bunch of stuff that Microsoft automatically puts on you computer that's used in businesses. unless you have your computer is used in a buisness, and needs to be connected with over 100 other computers at all times, it has no purpose. If you go ahead and delete the folder, you save a great amount of space on your hard drive, and it allows you to do much more stuff with your computer at a faster rate.
you're welcome in advance