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Windows 10 September Update KB5122878 causes No Operating System found on Acer laptop
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John Price
65
Reputation points
KB5122878 after many reinstallations of Windows 10 ESU consistently crashes a friends Acer laptop. Currently I have left this laptop not enabling ESU updates (KB126256) as I have failed to stop the KB5122878 update installing many times. Am I missing something? Can I stop this one killer update downloading and installing? I have already made the registry edit to stop WindowsUpdate, although I am not confident it works. Any suggestions to save this laptop as safely as possible, currently relying on Malwarebytes.
Windows for home | Windows 10 | Windows update
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(112.00000000000001, 90%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERP%3C/text%3E%3C/svg%3E)
Richard Paeschke 0 Reputation points2026-09-26T15:27:45.94+00:00 I have same crash on my MSI computer! It freezes snd must be push stopped on off button. Freezes about a minute after a normal? booting.
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Richard Paeschke 0 Reputation points
2026-09-26T15:28:59.19+00:00 And my computer is not allowing me to remove the update by either Update or command prompt.
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Answer accepted by question author
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 72%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESI%3C/text%3E%3C/svg%3E)
SD - IA
180.3K
Reputation points
Independent Advisor
Answer accepted by question author
SD - IA
180.3K
Reputation points
Independent Advisor
I have now installed the rogue KB5122878 🙂
That is actually the latest update :)
By any chance, are you from the EU? That may explain why enrollment in ESU was not needed.
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John Price 65 Reputation points
2026-09-30T09:34:48.5833333+00:00 I had to enrol in ESU, I'm not in the EU.
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Answer accepted by question author
SD - IA
180.3K
Reputation points
Independent Advisor
I also did research on the issue, and it seems that you are right :( There are some specific models before 2016 which aren't compatiable, sorry :(
6 additional answers
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SD - IA 180.3K Reputation points Independent Advisor
2026-09-26T15:48:42.0933333+00:00 Hi,
Please supply the following Information.
Right-click the Start button and Choose the Run option
Type in msinfo32
Press enter.
Take a screenshot of the System Summary window and post it in the next reply.
I look forward to your response and am eager to collaborate until we find a solution.
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John Price 65 Reputation points
2026-09-27T10:43:55.3333333+00:00 It looks like no one else has an answer to this :(
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John Price 65 Reputation points
2026-09-26T15:41:01.2766667+00:00 Unfortunately I dont even have an Windows 10 operating system and have had to reinstall from scratch.
I just dont want to install it, my only safe option is not to enable ESU, so the laptop is stuck in September 2025.