Steve,
As far as I can tell you can't have the TED and QHY drivers loaded at the same time.
Last time he said anything Marc was using the TED set.
I use the QHYCCD set.
If you have installed the TED set and want to switch you need to use the uninstaller on his site to clean up properly before installing the QHY set.
In Neb you can hide all the cameras that don't interest you. You must leave all the QHY models which use your chosen drivers in the list. All the TED ones or all the QHY ones.
Firefox doesn't like the packaging format because RAR is proprietry and that is contrary to the FSF way of the world. You can save the files and get peazip
http://peazip.sourceforge.net/ to unpack them.