I did a research last year and found that all these programs from Adobe, Magix and other have problems with later editions. Often they were reported to be not stable with real HD or when editing long videos. I found many complains in their forums or when I read Amazon reviews, especially related to the latest editions. Some problems were related to Win7 or 64-bit.

So in the end I bought Sony Vegas Movie Studio HD, that was told to be the most reliable one. I liked it instantly, there are tons of video tutorials included, good help and all the features that the other ones offer.