I went through the upgrade process from Windows 8 to 8.1 on my home puter. Microsoft, more or less forced me into it!! Guess what. Microsoft has finally got it right. All my data and all my software programs are intact. Even my Firefox browser settings, bookmarks etc are all the same and still there, wonders never cease. It's about time!!! Although I do suggest, as Microsoft does, that you do a complete user data backup first.