Hey! The automatic Windows update did the same to my Asus! All of my personal documents/photos/files etc dissapeared and I was unable to locate them. I spoke with two ITs, which got me nowhere. I tried several times to restart my laptop, use the "Recovery" feature. I even attempted to undo the update- all to no avail. Three frustrating days consumed with hopelessness ensued.
But then.
I had an idea that I was sure wouldn't work; I simply enabled the "Guest" User Account(Control Panel>Users) and restarted my laptop.
And KABAMM!!!!
Everything was back to normal- all my files were exactly where I had left them and we finally accomplished world peace
I don't know if your issue is similar, but worth a shot...