Something is wrong with my account after doing update.

Something is wrong with my account after doing update.

After doing an update on my laptop when i sign in to my account it says preparing windows for about a minute, but after i finally sign in my wallpaper suddenly changes to the the defult wallpaper, and i can find any of my downloads or any thing almost like its a new account, even though i can still see my wallpaper just before i sign in. Does anyone know how to fix this