I've tried rightclicking->personalize->click the image I want->save changes. After reboot it goes back to themes.
I've tried deleting the themes to avoid the problem altogether by going to C:\Windows\Resources\Themes , however Win7 put a lock on those files so even the computer administrator cant touch them.
Please someone tell me that I'm a dumbass and for not being able to find such a simple solution to this problem.