Lost all files!

I backed up all the files on my computer & had my computer reformatted. When I plugged in the My Book I had to reinstall the WD SmartWare & when it opened, it showed that the drive was empty!! ALL of the files that were on the hard drive are gone!! I don’t know how this could have happened!! Please Help!!!

First go into folder options and check show hidden files. Sometimes you need to do another backup http://community.wdc.com/t5/My-Book-for-PC/data-restore/m-p/161586/highlight/true#M5703