im thinking the wmp library needs resetting , that the original pictures folder in your libraries may be showing the images fine, if so its a case of removing them from the wmp library then getting it to re read the library pictures folder.
before you remove any files from wmp, make sure you have the check box UN - ticked
"delete from computer when deleting from wmp"
this setting can be found in options/library tab.
then you can remove the pictures folder ,
again, make sure you have a back up of the original pictures folder that you are going to add to wmp.