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Steam has now officially stopped supporting Windows 7, Windows 8, and Windows 8.1.
(www.theverge.com)
This is a most excellent place for technology news and articles.
I did ignore it, literally didn't read it. You have to run code or data from untrusted sources (or be available on a network) to get exploited, and I know that computer wasn't doing anything high bandwidth otherwise it would affect my gaming. I literally only played games on the install for a couple hours a night and my browser and other software was up to date.