I’ll opt to be the contrarian here and mention that I’ve had zero update issues on the multiple Win 10 machines that I use. A few observations:

1) Since most updates are updates to virus/malware definitions, it’s in your interest to download and install them, although I have my machine set to delay 30 days for any bugs to settle out. I would just add that Professional IT organizations always patch their aps and OS, and many shops have a patch manager that handles them
2) if you have Win 10 home edition, you don’t have a choice - you can delay the updates, but not turn them off. If you have the pro edition, you can delay them indefinitely.
3) if you schedule the updates at night when you’re asleep, you never notice them - they’re done when you come in.
4) Expecting MS (or any other company) to validate every update with every possible SW application and HW configuration is unrealistic - it’s just not possible to try every possible configuration in the hundreds of millions of users.
5) your options are Apple, which will cost you 2X for equivalent performance and have limited upgradability (and Apple is constantly updating as well, with their own upgrade issues which you can read about on UHH over the last few weeks) or Linux, which is good tight code, and fairly secure, but you may find limitations in what aps are available or in using your current aps. You pays your money and takes you choice - there is NO perfect OS.

I have a really old software (Alpha 4 which is a Dos based software) that I need to use for its database program. I’ve been using this program for nearly 30 years and it will only run on the XP version as the latest update. I have disconnected it from the internet to prevent it from updating to a later version of Windows. That computer is only used for the one database program for the past several years. For all of my other computer work I have been using an IMac for the past 5 years.
I tried running the XP Windows on the IMac, but experienced issues with some functions of the database not working correctly.
So the windows computer is only used for the database program only and does not get updated.

I’ll opt to be the contrarian here and mention that I’ve had zero update issues on the multiple Win 10 machines that I use. A few observations:

1) Since most updates are updates to virus/malware definitions, it’s in your interest to download and install them, although I have my machine set to delay 30 days for any bugs to settle out. I would just add that Professional IT organizations always patch their aps and OS, and many shops have a patch manager that handles them
2) if you have Win 10 home edition, you don’t have a choice - you can delay the updates, but not turn them off. If you have the pro edition, you can delay them indefinitely.
3) if you schedule the updates at night when you’re asleep, you never notice them - they’re done when you come in.
4) Expecting MS (or any other company) to validate every update with every possible SW application and HW configuration is unrealistic - it’s just not possible to try every possible configuration in the hundreds of millions of users.
5) your options are Apple, which will cost you 2X for equivalent performance and have limited upgradability (and Apple is constantly updating as well, with their own upgrade issues which you can read about on UHH over the last few weeks) or Linux, which is good tight code, and fairly secure, but you may find limitations in what aps are available or in using your current aps. You pays your money and takes you choice - there is NO perfect OS.

After hearing all of the Windows 10 update horror stories, I've decided that to protect the information that I have on my stable Windows 7 Pro Lenovo Ideacentre is to not upgrade it to Windows 10 and risk losing programs that will not run on Win 10. My solution is to buy a new Lenovo desktop, Windows 10 Pro and use the new computer for online and run the other one offline and keep everything important on that one along with the older programs that I don't want to lose. My only problem is that I presently run (2), 4 year old Acer monitors that I can't figure out how to configure so that I can use them for both computers, but not at the same time. I'm sure there is a way of doing it without having to unplug them from computer #1 and then plug them into computer #2 each time I want to switch computers, but the how-to is way above my pay grade. If any of you UHHers out there know how to accomplish this, I'd be grateful for the solution. I'm an old dog and learning Linux would be a bit much for me. I've been warned away from it by experienced computer programmers.