I thought it could be useful for some users who are having problems with PowerDirector to know that I definitely had quite a few issues. I ended up re-downloading the main files (6 of them) and re-installed, after uninstalling the first one.
Since my second program download, I have had all functions working correctly and minimal crashes. I have not had a 'broken file' since this second effort, and have been working with the program for a good 6 hours today..
Perhaps it is worth trying if you are having lots of problems