Live Ask Juan: Upgrades to help an older PC with Video Editing?

Got another great reader question. Thought I’d take to the Youtube’s to answer it!

From Youtube viewer TableReadTheater:

Hey Juan,
I have an older PC, like 3 or 4 years. It still runs ok, but I want to start doing some video editing. I can’t buy a new system yet, but I can spend a little on a few parts. What kinds of upgrades can I do to help it run better for video?