That's nasty, Simond9x. I was in IT for decades too, which is why I don't let anything auto-update. Uncheck that option for Windows. It will save you another roll-back, which I gather is not always 100%. Perhaps Restore points get corrupted as well.
As I mentioned, they slipped in the Win 10 upgrade at the bottom of the Win 7 security updates. Sneaky. There was no warning. Fortunately, I perused the list before I let it run.
The "oops" factor is far too common for all manner of software these days. We wouldn't release anything to users until it was thoroughly tested, including OS updates. Of course, Unix / Linux-based systems are relatively easy to fix, because of open source. Windows is a black box.
I'm hanging on to Win 7 as long as it has support, but I will run W 10 on the same machine. The latter is inevitable. No choice with a new computer I bought. It will be an interesting weekend.
Cheers.