Taking screenshots in RealPlayer

Hey.

I'd love to make wallpapers and icons from screenshots from my RealPlayer (v10.5), but when I play a movie or show, I can't do it. I'm using an outside source (not a DVD) to play the show, i.e. "click on the link and such-and-such will play", and I don't know if that's contributing to it.

From what I've found on the web, specifically at: http://www.darknet.com/2005/04/how_to_capture_.html - they say "For RealPlayer, you will need to turn off the optimized display. You can do this by running RealPlayer, clicking on View -> Preferences, going to the Performance tab, unchecking the box labeled "Use optimized video display", hitting OK, and restarting RealPlayer. Now you may make take a screenshot by pressing the [ALT + PRNTSCRN] combination. You can paste this screenshot into any graphics editing program (e.g. MS Paintbrush) and save the file. When you are done taking screenshots, you should re-enable the optimized video display because this makes videos play smoother and look better."

The problem here is that for me there is no Preferences under the View menu, nor is there any place I find a place for an 'optimized video display'.

Is this possible at all, or is there another method?