Windows 11 KB5089549 reportedly failing to install, slowing internet down on certain systems

Microsoft's latest Patch Tuesday updates apparently face persistent installation failures and internet slowdowns on some PCs.

Yesterday Microsoft released its newest Patch Tuesday updates (KB5087544 on Windows 10 and KB5089549 on Windows 11). However the latter could be having installation issues on certain PCs as reported by users. These affected users say that the update is stubborn as it just wouldn't install even after trying several times. It is slightly unfortunate considering Microsoft just announced a major Windows Update improvement regarding driver updates.

One such user describes that the Windows update page throws up the following message after failing to install: "Something didn't go as planned. No need to worry--undoing changes. Please keep your computer on." Hence the good thing is that the failure does not lead to a total system mess as it is reverting to a stable state before the update. The thread was opened on Reddit and several users chimed in stating that they were also affected by a similar bug or had recently experienced it. Interestingly, some people are saying that this has been affecting with several of the recent Patch Tuesday updates so we wonder if there is something else too at play here that's causing the serial failure on certain devices.

Hopefully Microsoft may be investigating, though the company does not seem to be aware of any issue at the moment on Windows 11 as the Windows Release health page says there are "no active known issues". Perhaps there aren't enough people complaining about it at the moment for Microsoft to bother, or at the end of the day, as Microsoft has alluded to in the recent past, it could also be user error.

Besides that, some are also reporting internet-related problems with apparent performance issues like slow internet access that started "immediately after deployment of KB5089549"; however there are no other reports about such an issue online at the moment so perhaps there is some configuration issue in this case.

Let me know in the comments below how your own installation experience of Windows 11's latest patch was.

Source: Microsoft forum, Reddit (link1, link2, link3)

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Posted Thursday 14 May 2026 at 11:54 am AEST (my time).

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