I lost all my files after I shutdown in Windows10, how can I get them back?

[Windows Central Question]

I lost all my file after i shutdown in Windows10

After i update to Windows 10 !! All my photo and files lost
And i attempt to redownload back my photo but after i shut down my deskop
The photo that i download is all lost again!!
Its been 3 to 4 times ...My file lost after i shut down!
Anyone can help me solve this question?