[Plugin: NextGEN Gallery] Can’t get Images to show (No GD support)? Help please

I have my plug-in installed and activated. Problem is, I can’t get the images to show. I only get file names coming up. They are clickable links, but not images.

In the NextGEN Gallery Overview, it says “No GD support” in the box that says “Graphic Libraries”. Is this my problem? If so, how can I correct this?

TIA