Windows Movie Make Publishing Question

[walkwithheroes]

I usually put all clips I'll want to later use onto DVD-Rs. Last night I imported the clips from the DVD-R onto my computer. Then, I put them into Windows Movie Maker. I made a little video and went to save it, but the project froze at 2% and the remaining time went up and up. I tried to update my codecs (divx, ffdshow), but that didn't work. I ended up having to save it as a huge file.

Any idea why WMM is freezing up, just on videos made from clips imported from DVD-Rs? (Clips I've imported and used before.)