Windows Movie Maker Question

This may be a wild stab in the dark, but is there anyone out there who has any knowledge about Windows Movie Maker?

I have edited a 15 minute movie*, and would like to save it in a DV video format from the software (as this will be the best quality output to convert and burn to DVD).. However every time I try to save the movie, the program seems to throw a bit of a fit, and ends up generating a 18 gigabyte file that has a running time of one hour and twenty six minutes!?!?  Now the original (unedited) footage I originally imported from the camcorder is only 22 minutes long, so quite where this mysterious hour and four minutes have come from I have no idea??

I have tried saving the project under a different name and selecting a different destination for the movie, but the file that gets output is still 18 gig in size.  This is very annoying.

If it turns out that I cannot output a DV AVI - what's the best file format available (from the non-Media Centre version of Windows Movie Maker) in terms of quality? 

Alternatively is there any alternative packages that can do the capture from a DV camcorder, editing (including digital wipes between edits for that truly George Lucas look between scenes) and burning directly to DVD?

Any help or advice would be greatly appreciated..

* - Aye, this is a very "proud Dad" movie, but I care not as she looks very cute all the way through and her grandparents in Spain will be very pleased to receive the DVD (as they have not seen her since June) if I can ever get the sodding thing to work...