problem with windows movie maker on vista please help

hi guys my problem is that i added a credit title at the beginning of my movie lol and then i cant add a sound track or a pic or a vid , anything to the rest and continue with my clip , i added the items i want to the box here but whenever i drag the pics or track or vid it jus wont work and wont stay down there for watever reason, idunno wat to do tried everything, please help
heres the pic

and when i try pasting my pics aand stuff on the timeline i get this error

thanks alot
Answer #1
Ahhhh all Windows Vista is the problem !! Solution:Put XP