I am logging on to

Question

I am logging on to my acer aspire 9301 awsmi. Never had any problems before but now it is logging me on as a temporary login and all my info such as music, pictures and photographs are gone. Also my saved icons on the desktop have gone. It is like it thinks its the first time it has been switched on. At top right of the screen is a box with some of my photos which i find strange. This is probebly something simple. please help !