I know that you cannot right-click the images, but can you highlight them and press the 'Delete' key?
If not, if you install the PMB software that came with your camera, this should allow you to manipulate the files from your computer. The latest versions of the downloadable software are available from here:
I already tried using the highlight/delete method and that also won't work. I already have the software installed but don't really care for using it. I prefer to plug my camera into my pc, click browse and drag the folder onto my computer from my camera. it's way less hassle than having to select individual images to import.
and besides, that method doesn't work either because it was one of the first things I tried.
it's bad enough trying to force people to use proprietary software to do unnecessay tasks, but it's worse when even that won't do what you want it to.