IMovie no longer working.....weird anomaly just before......

I was transferring some videos from my camera.  The iMovie ap shut down during transfer.  When I started it again it worked for a bit....
I then tried to download the camera videos again.  It would not let me use the same event name...i use the date....it said it was already used(today) I then tried to use the date when videos were taken....also said was already used...use another.
thing is they dont exist on the side panel showing event library...
no biggie....
a bit later my screen (iMac 27") turns into a massive strobe light....and my second screen has artifacting going on...
tried restarting, stopping programs, etc...nothing works
needed to force power off by holding the power button
ok.....restart doing other stuff .....
finish all my other work
now to get back to getting the videos download....i start the ap....all i get is a black bar on the left.....blank white screen 
only think is a clipped of import button and the other two to its right....
they dont work....
How do I delete or reinstall iMovie and keep all my videos safe?
Can I check on them with another program to see if they are trashed?
Wow.....gotta say Mavericks has been a disaster.......never had problems with previous operating system

What version of iMovie?  10, 9.0.9, or what?
Phil

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