Mybook Essential External Drive 1T

I recently purchased a 1T MyBook. After I had installed or otherwise done everything that I could see to do,  I did my first backup. However, what I backed up was not my Win 7 MyPictures/MyMusic etc. What I got was garbage. It appears to be some files that I deleted from my laptop months ago. The WD Drive is not “finding” any of the file extensions that are described in the manuel. The only way I can get files backed up is to manually right click on the file and “send to Mybook G:” How do get this thing to find all of the files that should be getting backed up.

Did you get a work around on this issue?