Question about Certain folders and Files

I’m asking here about certain folders that have a mass of files, one of which is C:\Windows\Installer. In the Installer directory, it has about 6 GB of files, and I have no idea what these are for. Also I’m curious about C:\Windows\winsxs, and if it also affects my computer in some way

My main question is this: can I delete the files and folders in the Installer folder safely without my computer going B.S.O.D on me, or is it un-needed. And if some of the files can be deleted, is there some tool which can help me in that regard?