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After much messing around -- note: Safe Mode with Command Prompt is not the way to go! -- the laptop system is back to where it was before the fatal update, but minus 50Mb of antivirus updates. Which it is now downloading, slowly. (I just hope that was the problem. Having it fall over repeatedly *in safe mode* does not inspire confidence, but I'm no Microsoft Engineer. The last time I had a Windows machine go unstable on me like that it was a dead hard drive, but this doesn't seem to be that.)
Update to the update: Googling around finds a couple of other people who got trouble with the latest batch of updates for Vista 64. I rather suspect that the culprit is kb973879, which is supposed to be a fix for multi-processor systems (with bad BIOS?) blue-screening when installing Vista SP2. Slightly bizarrely, the only one in the batch that's labeled "important" is a daylight-saving-time update that appears to apply to Egypt.
Update to the update: Googling around finds a couple of other people who got trouble with the latest batch of updates for Vista 64. I rather suspect that the culprit is kb973879, which is supposed to be a fix for multi-processor systems (with bad BIOS?) blue-screening when installing Vista SP2. Slightly bizarrely, the only one in the batch that's labeled "important" is a daylight-saving-time update that appears to apply to Egypt.