New Windows 10 update causing major PC problems for some — here's the fix

What you need to know

Windows 10 KB4556799 is causing several issues for people.
Issues include the file deletion bug seen in previous updates, audio issues, and the Blue Screen of Death.
This is another wave of issues to appear in relation to Windows Updates this year.

Yet another Windows Update is causing issues for people. This time, it's Windows 10 KB4556799 that's causing a wide range of issues. TechRadar reports several issues that people have flagged on Microsoft Community and answer posts, including the Blue Screen of Death, white screen flickering, system fonts being replaced, systems switching back to S-mode, and Outlook search issues. Windows Latest adds that some people have audio issues as well as the reappearance of the Temporary user profile bug that's been seen with previous updates. The latter is particularly serious as it can delete people's files and change settings back to defaults.

At this time, it's unclear how widespread these issues are, but the variety of issues is concerning. Several Windows Updates have had issues recently. Windows 10 KB4556799 has several of the same issues as previous updates and introduces some new ones as well, according to user reports.

How to fix Windows Update problems on Windows 10

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If you have installed it and have any issues, you can easily uninstall it with these steps:

Select the start button or Windows Desktop Search and type update history and select View your Update history.
On the Settings/View update history dialog window, Select Uninstall Updates.
On the Installed Updates dialog window, find and select KB4556799 and select the Uninstall button.
Restart your device.

Sean Endicott is a News Writer at Windows Central, where he covers Windows 11, Surface hardware, Microsoft 365, AI, apps, and the broader PC ecosystem. Since joining the site in 2017, he has written well over a thousand articles across the Microsoft landscape, covering breaking news, analysis, and feature reporting.

He writes Windows Wrap, a weekly column covering the biggest stories in Windows and the PC industry, and what they mean for the platform going forward.

Before joining Windows Central full-time, Sean worked in journalism and media production after earning a First Class degree in Broadcast Journalism from Nottingham Trent University. Outside of tech, he is an award-winning American football coach based in Nottingham, England, and was named BAFCA Youth Coach of the Year in 2024.