We might need a little more info I’m afraid! Can you explain what you are doing when it crashes; are you adding video to the timeline, scrubbing the timeline, or working with filters when the software crashes? And by “crashes”, what do you mean … is there some kind of notification or message, or does it just freeze and stop responding?
Can you please try uploading your log file here for us to look at. That can be found under View → Application Log.
I would try a full uninstall and reinstall, exactly as described below (taking special care to complete the folder deletion and registry cleaning).
Also, you could try a different version for testing purposes.