My iMovie isn't opening -- it worked fine earlier today and now  nothing

I worked on a couple movies today, deleted a few projects and a couple hours later my iMovie has just stopped coming up. I don't know what to do. I read somewhere to put iMovie in the trash but I have several things on there that I don't want trashed so that isn't an option for me. I'm so frustrated. I have the snow leopard (I think) - the one before the new system that came out this year. I haven't updated cause when I bought my new video camera th esales woman said that the new system doesn't work with this camera --- so now I have  a new camera I can't even use cause the iMovie won't open. It comes up on the top - just that informational stuff but not the actual iMovie -- I scrolled down for check for updates and it popped up for a millisecond. Don't know what to do - tried turning the computer off but still nothing.

Try this:
Reboot your Mac, while holding down the Shift key (this is called Safe Boot Mode). When you see the timer start spinning, and eventually see the text Safe Boot Mode, let go of the Shift key.
When you see the Desktop launch iMovie and see if it can load the program.
If it fails, try deleting the Preferences file for iMovie.
Go to Mac HD > Users > (your home folder) > Library > Preferences > look for com.apple.iMovieApp.plist
If you have an earlier version of iMovie installed it might be named something like com.apple.iMovie8.plist.
Move that file to the desktop by dragging it out of the folder. Or even drag it to the trash. Try launching iMovie again.

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