Windows 11 24H2/25H2: KB5124010 preview reportedly causes boot problems, slowness, game crashes
Summary
Users report various problems after installing the KB5124010 preview update for Windows 11 24H2/25H2: slow boot, shutdown and search, a boot failure after uninstalling, and games crashing. These are reported by users, not yet confirmed by the vendor. Only 2 independent sources were found. A separate AC-3 (Dolby Digital) app crash is mentioned as resolved by KB5127648 according to the research notes.
Symptoms
- Slow boot, shutdown and search (unconfirmed)
- Boot failure after uninstalling the update, requiring a clean reinstall (unconfirmed)
- Games using Easy Anti-Cheat/Javelin crash within seconds or minutes (unconfirmed)
- Apps decoding AC-3 (Dolby Digital) close unexpectedly (research notes say this is resolved by KB5127648 and confirmed by Microsoft; no vendor source was provided here)
Affected
- Windows 11 24H2 and 25H2
- Update: KB5124010 (preview)
Workaround
No workaround known.
Fix
Not fixed yet for the community-reported problems. For the AC-3 crash, KB5127648 is named as the fix in the research notes.
Recommendation
Do not roll out the KB5124010 preview update to production systems; preview updates are optional. Test it on a pilot group first. Do not uninstall it on affected devices without a current backup, since a failed uninstall was reported to need a clean reinstall. Check for confirmation from Microsoft before acting.
Reports from the community and trade media
Reports from forums, Q&A sites, Reddit and trade media – linked only, without the names of the authors; the vendor’s statement is authoritative.
- KB5124010 disaster: one Windows 11 update News · tech.yahoo.com, 5 Oct 2026
- Report: Windows 11 KB5124010 crashing games within minutes Community · neogaf.com, 23 Sep 2026
Sources
- KB5124010 disaster: one Windows 11 update News · tech.yahoo.com
- Report: Windows 11 KB5124010 crashing games within minutes News · www.neogaf.com
Compiled from community reports and web research and translated with AI (Claude) – not yet confirmed by the vendor. The vendor’s statements are authoritative. Updated 1 Nov 2026, 17:04.
Where the information comes from
We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:
- Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
- other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
- community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
- targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
- early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online
Summary and translation with AI (Claude by Anthropic) – without any data of visitors.
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