I don't think your problem is your PC. You have 4.00Ghz which is very good and an excelent Video Card with 2GB, and enough RAM memory.
You're problem is actually unknown by me. I know this is not what you wanted to hear, but it's true.
Try to reinstall the game. Maybe Video Editor was not installed correctly. Sorry, Delta, can't help you further.
But, anyway, good luck with that.