My production machine has been on Windows 10 since the second Insider Preview build, back in 2014. We have a handful of laptops that are on older versions, however. One of them, which runs Windows 8.1, was upgraded to Windows 10 for a few weeks once 1511 landed, but it did not handle the transition well. There was a few nasty glitches, including 100% screen brightness for some reason being interpreted as 0% screen brightness, making the display turn off when I plugged it in (until I realized what was going on).
No problem, I thought to myself, I will just roll back to Windows 8.1. I gave it a shot.
That's apparently not good for Microsoft. Windows Update apparently has no record of an upgrade being rolled back, because the first thing it asked me when Windows 8.1 was restore was to upgrade back to Windows 10. Noooooooooooooooo. I will not, Microsoft, at least not until some later service release fixes these issues.
All I could think of is, if these are the problems that I'm having, how are novice users supposed to figure this out. It turns out that Microsoft has added a couple of Windows Registry keys to block the various naggings. Once I set them, the OS didn't complain or try to hide standard Windows Update buttons with Upgrade to Windows 10 ones. Registry keys are definitely not for novice users, but many of our readers should be comfortable with registry editing, and they may know novice users who would like a little help.
ll you need to do is change two keys:
- Change or add a DWORD named AllowOSUpgrade with a value of 0
- Change or add a DWORD named DisableGWX with a value of 1
- The GWX folder (called a key in the registry) wasn't present. I needed to add it.
After editing the registry and rebooting, everything Windows 10 nag-related was disabled and I could install Windows Updates. Applications exist to set these keys for you, but it's probably better to just do it yourself. The ZDNet article, linked below, also has a few files to automatically apply these registry keys to your system. I like doing these things by hand, though.