Techy help needed, please!

I can take screen-caps using the DVD player on my computer, but in order to do so, I have to disable something called 'hardware motion compensation'. This means that whenever I think "Ooh, must get a screen-cap of that!", the thought is almost always followed by "Ah, but I'd have to do that disabling thingy, wouldn't I? Gah, maybe I don't really need that screen-cap after all."

What I'd like to know, therefore, is how important hardware motion compensation actually is, and whether I could get away with just leaving it off all the time? Can anyone advise?

BTW, my computer is a desktop, and I never move it around anywhere. If that even has anything to do with hardware motion compensation...