Windows 7: changing album art in wmp12

I keep getting this message when changing album art although im not using the file . it will change the art but not on all the tracks so when i use wmp in small panel view i have album art for one track then default image for the rest !? any ideas this is happening after clean install, upgrade install previously gave me no probs whatsoever in fact i used feel sorry for everyone who clean installed and posted all sorts of issues with Windows 7, now im one of the majority

bump,