Depends on what you mean by factory settings. There are several ways depending on what you want to do. One is to change things back to "default". Another would be to reinstall everything "as new". What are you having a problem with?

I have over 600,000 files on my computer and it is running slower all the time. I have tried everything I know to get rid of them. Nothing has worked so I thougfht if I went back to the original way it was that would takw care of it.