Windows 7: Unable to delete

Hi , i have been trying to rearrange the music files on my computer and have deleted all the folders in My Music. When i go to delete the songs in WMP12 i cant and get a message 'Windows Media Player encountered a problem trying to play this file". Luckily i didnt have much music on my computer. I understand that i have probably gone about it the wrong way . Is there any way now that i can remove those music entries showing in WMP12. I am using Windows 7. thanks, Blocka

In WMP, go to Organize > Manage Libraries > Music > Highlight the library you want to delete > Remove