iMovie 4.0.1 will not open

I have been using iMovie 4.0.1 on my iBook (933Mhz, OS10.4.11) without issue, although I have used it very little. One day it quit and now it won't open, I get a message saying it is "damaged or incomplete"

Anybody run into this issue, know a way around it? I have already tried reinstalling from the disc, didn't do anything.

Give this a try.

Delete the iMovie application
Go to your home folder ~/Library/Preferences and delete com.apple.imovie3.plist and com.apple.imovie.plist
Go to System/Library/Receipts and delete anything that starts with iMovie.
Reinstall iMovie.