I've tried all the normal switches, and nothing works. Anyone tried this before?

It's a Nullsoft NSIS installer so it's /S (capital s)

You might wanna try UltraISO which is IMHO the best ISO tool.

Don't worry; after what just happened, I will be using UltraISO. I just *hate* the GUI for it

ISO Commander has just ruined two of my cd images just by opening them!!! WTF? It made several files on the image unreadable after they are burned.