remove the windows 8 consumers preview watermark in these easy steps 

Steps : 

 - Unlock Task Bar

- Move Task-bar to Top of Screen

– right Click Desktop
– Personalize
– Click Desktop Background

– Change Picture Position to fill or something until you see the watermark move down

then

– Drag Task bar down
– Lock Task Bar Done

all the credit goes to pirate-bay user 

http://thepiratebay.se/user/SS64084/