Thanks Jim.
We had made a restore point before we started, so hopefully it would have been relatively easy to get back in case of disaster.
It's a USB-based amateur radio receiver and software. Best Beloved has just updated the USB drivers for it, which required the reboot. It took ages to install, with no real feedback, then seemed to stall after the restart.
He's now managed to get it all working again, so he's reasonably happy. For now.

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Snaptophobic BloggageHeather Kay: modelling details that matter. "Let my windows be open to receive new ideas but let me also be strong enough not to be blown away by them." - Mahatma Gandhi.