I downloaded OSX and I lost all my apps, pictures and MS software
I downloaded OS X Mavericks on my MacBook Pro and I lost all my apps, pictures and MS software????
MacBook Pro, OS X Mavericks (10.9.1)
If all your files are missing
You may have logged in as a different user, such as Guest. Open the Users & Groups pane in System Preferences. Your name should be at the top of the user list, under Current User. See also this support article.
If files are missing from one folder
Change the Finder view mode; for example, from icon view to list view, or vice versa.