Honestly, genuine IT managers are treating the upgrade with the same intensity and depth of analysis as a malware attack. They do this because they say that the unwanted upgrade acts just like malware.
Go ahead and keep your Windows installation, but I submit you might get a lot of mileage out of learning an entirely different strategy for handling updates. I suggest you try Autopatcher. Their primary contention is that not all the updates are in your best interest, so their own technicians look them over and encourage you to ignore just about anything that isn’t a genuine security update or bug fix. But honestly, it requires you spend time reading and studying how their patcher works and completely disable the Windows Update Service. In fact, it’s complicated enough that the Autopatcher guys start you off reading their forum posts to find out how to start using their stuff.