Music in Zune collection isn't the same as on Zune player

Hi,

I have all the music that I want in my Zune collection but my Zune player still shows music that I have deleted from my collection. For example I have '65 Days of Static' in my collection but on my Zune Player I still have '65Daysof Static' and '65 Days of Static'

Thats just an example but basically just wondering how do I get my Zune player to reflect whatI have in my Zune collection?

Thanks

Colum