Hi Matt,
I may be able to help you with your Vista issue and I can offer you some insight to PD6--
First of all, I too, was having a problem with getting PD to run on Vista. To fix the problem, what I did was run the 'compatibility wizard' on vista for PowerDirector. To do this, just go to your windows 'help' menu and type in 'compatibility wizard' in the search bar. This will bring up instructions and prompts for you to run PowerDirector. I chose to run it with Windows XP settings... do not adjust the display settings though-- when it asks you to check a display setting box, leave blank and click 'next'. It should then ask you which Operating System last worked with the program. Choose XP, since it seems to not like Vista yet. That's all, the program launched wonderfully without further ado.
Secondly, I spent about 3 months researching and researching editor software. Not wanting to spend thousands of dollars
(...yet!) I went with the best simple software for the money. I found a cool website that offers reviews and it rated Power Director #1. After you copy and paste this link into your browser address bar scroll halfway down the page to see the reviews:
http://video-editing-software-review.toptenreviews.com/?ttreng=1&ttrkey=powerdirector
It IS very easy to use, it's very intuitive and has a plethora of features that are useful, creative and practical. So far, the only limitations I have found are within my imagination. As a creative editor, I can honestly say that I do enjoy using PowerDirector. I'm still learning each feature that it has, but when I run into a snag or can't figure something out, the help menu within the program is EXTREMELY useful and easy to navigate.
Hope this helps. Let me know if you are able to get it to work with Vista. I can't garantee you anything, but running the compatibilty wizard was all it took for me.