BorKed Gallery Items Stuck In My Library

Ok, I dled a few gallery houses from here and they are broke. They show a llama thumbnail and give an error. How do I get rid of them? I really want to delete them because its annoying as hell.

Cant you simply delete them in your Gallery? I deleted a couple of mine which I no longer used.

Nope, I get an error when I select them and it blocks me from doing anything else.