I disabled the win32 cabinet self-extractor thinking I could re-enable it whenever I wanted. Booted in safe mode with networking, then computer configuration > administration templates > system. I was pissed when I did it (8 pints of cider), and the notes I made just say "remove access".
I remember selecting the relevant bit and setting it to "disabled", but cant remember exactly what I did from there. When I try to reverse it, I can get as far as the "system" bit, but after that, I'm a bit screwed.