Help with Dell Inspiron Desktop Vista

I lost all my files, photos, downloads, favorites on my Dell Inspiron Desktop runing Vista.

Suggestions on how to retrieve ?

I looked under "Users" and there is nothing there other than the name of the users.

There is also no hidden files that contain my documents that I can see.

Malware scan came up clean, System Restore did not retrieve any files.

Any help is appreciated.