I need to recover a file?

I'm using the Lenovo thinkpad and i was logged in as a guest. I got halfway through my project when power point started acting strange so i logged out. I logged back in and all my files were gone! Is there anyway to recover that file? (I have a name account for this computer i was accidentally logged in on guest.)

Added (1). Ps. I saved the file so i know what the file name is

Added (2). None of those worked

That's too difficult

Try free data recovery free tool eassos recovery free. If this tool doesn't work, then sy goodbye to your files.
http://www.eassos.com/eassos-recovery-free.php

Try free software called recuva

Go into seach on the sidemenu, the type in the name, and reopen, hope this works!