Locks up when i try change desktop background!

Ok i need help as per the title of this post. When i open system preferences and click desktop & screen saver it locks up and then closes! I can right click on the desktop and choose change desktop background but it opens automatically on the screen saver tab and when i click the desktop tab it then locks up and closes. i think it might be something to do with the picture i have on the desktop atm but im not sure!

Any help will most appreciated..

Cheers ppl!

owen

 

yeah i've tried restarting, its been a problem for a few weeks now.

Dont know how to repair through disk utilities so i'll have a look at that next..

cheers mate

 

ah yes changing it through safari worked!

Thanks very much!!!!