Hi all. In all my years of owning a mac, I've never reinstalled the OS, which is why I'm a bit concerned my first time (I'm having a weird login screen flicker issue which I think is software related). So to make sure - does the solution described in this article: http://support.apple.com/kb/PH10763?viewlocale=en_US&locale=en_US change the system's settings but keep my user data? Also - when Mavericks rolls out (and I plan on buying it), will installing it essentially have the same procedure as reinstalling the OS? Thanks!