hi, when i open my WMP, if i click on file then 'open', a box appears, at the bottom of this box it says 'file name' when i click on this, a drop down box appears with a list of things which i have listened to or viewed even though those files may no longer exist on my h/d. how do i erase all that stuff and even more importantly how do i make sure it isnt stored there in the first place. thank you