I have Windows set to not install anything.
I have completely unpatched Windows. Not a problem.
I want to impress upon you and every FReeper out there that this is one of the worst exploits ever uncovered, and it is speculated that the CIA has known about this and used it around the world for years. NOT patching is quite literally the worst thing you could possibly do.
Reading through black hat IRC and bulletin boards shows that this exploit is terrifyingly simple to use, and plenty of POC code has been uploaded to Github in the last week in every modern programming language out there.
Again, you're only playing yourself if you don't patch your system! This exploit allows attackers to read everything out of your system's memory in cleartext. Passwords, browser history, emails, instant messages... EVERYTHING. Don't be an idiot: patch your systems!