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Steam no longer supports Windows 7, 8, and 8.1
(www.neowin.net)
This is a most excellent place for technology news and articles.
"On a whim" means they unintentionally throw out a sloppy updates that bricks some computers. Which I have given you evidence of.
Not permanently except for corporate versions.
Chances are much more likely the update broke their computer because their computer contained some software and/or drivers too obscure for Microsoft QA to care about.
The issue was still present with W7 if that's what you meant, the issue would be much more common if it was an hardware issue and it doesn't really matter in the end, you keep dodging the part where you can forgo updates for a while, but in the end the risk factor becomes so great that you must be an idiot to do so long term.
And need I remind you, if you're not a troll and you're truly still running W7, you haven't had any updates in at least a year... Which would explain you not realising that buying from Steam doesn't make you own the games...
Anyway, I'll stop entertaining you, have fun playing games on a sub par system that isn't compatible with the latest versions of direct x and that hardware manufacturers are starting to stop supporting! Oh no, that's right, you can't use Steam anymore sooooo... No more recent games for you, just a whole bunch of malware and keyloggers! 🙂
You are far from entertaining. I did have to reinstall my OS from scratch one time, but that was because of a hard drive failure, not a virus.