Windows Movie Maker.

Ok, I've been trying to edit and put a whole bunch of videos into one big video.
But when I add about 4 short videos and try to play what ive done so far it always says
'Not enough storage is available to process this comand'
& it wont let me play what ive done or add any more videos to it either.
I've tried various things but I really have no idea how to fix this..

Try adding less and less until it lets you!

Well don't cram soo much in it because it wont work when you do that.