Vista - Vista Premium - Movie Maker, DVD Maker - problems!

I'm experiencing problems with Movie Maker (and DVD) maker in Vista Premium.
I've recently upgraded from XP (on a new machine) - I've been using Movie
Maker on XP for ages.
My main problems with this version are:
I can only add transitions in Storyboard view (in timeline view wmm closes)
I cannot expand the Video Track to mute audio (again the programme closes)
I cannot save as an AVI file (again programme closes down) I can only save
best fit for my computer
I cannot publish directly to DVD (DVD maker will also not work with AVI
files - it closes down!)
Does anyone have any suggestions? If so, I'd be grateful - I'm finding it
frustrating that I cannot produce the quality of video (and editing) I've
been used to with XP.
Thanks
--
Alison