This baby needs full use of your computer for the install. This is nothing to worry about, because, unlike most programs, this one does keep a back-up of changed files, if you do encounter problems.
Lets get clear here first of all.
I am not your multi-media pro. There is even better news. It walks you through the processes so that even I don't get screwed up. Not to mention, the really impressive Help section. Play and manage all popular media formats.