Lucas Gouveia / Corbin Davenport / How-To Geek
Like many of you, I'm no stranger to Windows breaking itself after an update or otherwise ruining my day, but since I expect it to fail I tend to have backups and mitigations in place, so at worst it's annoying. As long as you don't use it for anything mission-critical, you're OK.
But millions of people around the world do use Windows for important, mission-critical work. Which means that when a bug in Windows causes havoc, it really causes havoc. Deciding which was the most disastrous bug (either for us or for Microsoft) wasn't easy. If anything, there are too many candidates.
The Windows 10 update that deleted user files
I'm sorry, I can't let you read that, Dave
Since I already mentioned busted updates, let's kick off with one of the worst examples. After Windows 10 update 1809, some people noticed that their documents were going missing. Publications like ZDNET were quick to spread the word and try to warn people not to update their machines.
Heads up to anyone updating windows. Apparently, if you have documents saved in your user directory, i.e. users/JohnDoe, and not one drive, the update will delete EVERYTHING in that location. So if your "Documents" or "Pictures" don't have a one drive symbol, MIGRATE IMMEDIATELY!— coolKevinator (@coolKevinator) October 4, 2018
As the above X user notes, the bug seemed to be wiping out files stored in the designated folders for photos, documents, and so forth. Obviously, Microsoft rolled out a fix real fast, but for anyone that had no backups (it's never too late to start!), these losses were permanent. I bet a Mac didn't seem so expensive anymore.
PrintNightmare turned printers into a security disaster
As if printers weren't annoying enough
Lucas Gouveia/How-To Geek | NewFabrika/Shutterstock
Printers already have a terrible reputation in IT circles, but in 2021 the Windows Print Spooler service became the center of one of the most serious Windows security flaws in years .
This bug allowed attackers to run code with no verification and, as a result, take complete control of a remote machine. The aptly-named "PrintNightmare" affected nearly every supported version of Windows, including servers used by major businesses and government organizations.
The rushed fixes from Microsoft ended up breaking printer functionality for some people, and some companies just killed their print spoolers until further notice. I know this was a serious one, but it also feels so dumb for no good reason.
The Windows 98 plug-and-play demo crash
Plug-and-pray you don't make a fool of yourself
This one deserves to be on this list because it was devastating to Microsoft's reputation. During a live Comdex demonstration in 1998, Microsoft was showing off Windows 98's new Plug-and-Play capabilities. The idea was simple: plug in a device and Windows would automatically detect and configure it.
I still clearly remember how excited we were with the whole idea back then, as anyone who'd spent three hours trying to get a sound card to work would be.
As a scanner was connected during the demo, Windows displayed a blue-screen error message in front of the audience. The moment instantly became one of the most famous public software failures ever recorded. Worst of all, this happened right in front of Bill Gates, who sheepshly quipped, "That must be why we're not shipping Windows 98 yet."
Windows Genuine Advantage locked out legitimate users
More like Genuine Disadvantage
These days, Microsoft seems pretty laid back about whether you have a product key or not , but before Windows became a vessel for selling subscriptions, things were tighter. In 2007, Microsoft's war against software piracy produced one of the company's most infamous self-inflicted disasters.
The Genuine Advantage DRM flagged a huge number of legitimate users as pirates. Suddenly, these innocent folks found parts of their OS disabled, and, of course, updates and customization stopped working. The issue was caused by a buggy server-side deployment that incorrectly validated activation keys. Since this was a server-side problem there was nothing anyone but Microsoft could do about it. So it also served as a nice little taster of what that always-online life would be like going ahead.
Do you know who didn't have this problem? Software pirates with cracked copies of Windows.
Why Windows failures hit so hard
It's easy to hate on Microsoft, but the only reason it matters enough to generate that hate is the dominance of Windows. Because so many people and businesses rely on it every day, any bug has the potential to do massive damage. Microsoft is also keenly aware that its quality has been slipping of late, and it's executing a plan to fix Windows 11 . Not that I'm filled with confidence. Broken Windows 10 updates did enough financial damage to me years ago that I switched to macOS for any task I depend on.
Although it wasn't a Windows issue, the Crowdstrike disaster also made it painfully made it clear just how dependent we are on Windows, and the next big bug might be one we don't recover from.
