Windows 10 users report being unable to install Microsoft's January security update and getting 0x80070643 error

Microsoft released the security update KB5034441 for the Windows 10 system on the January 2024 patch release date, which mainly fixed the CVE-2024-20666 vulnerability. This vulnerability can bypass BitLocker encryption. Access encrypted data.

However, according to feedback from Windows 10 users, a 0x80070643 error will occur during the installation of KB5034441, indicating that the installation failed.

After the user restarts, the Windows Update page will prompt that an error occurred, please try again later. The Windows Update error reads:

Encountered an update installation problem, please try again later. If the problem persists, search the Internet or contact support. The error code: (0x80070643) may have a solution.

Microsoft reminds users in the latest support announcement that when installing KB5034441, if there is insufficient space in the Windows recovery partition, the "Windows Recovery Environment Service Failed (CBS_E_INSUFFICIENT_DISK_SPACE)" error message may appear.

When you install the KB5034441 security update, Microsoft will install a new version of Windows Recovery Environment (WinRE) to fix the BitLocker vulnerability.

However, the recovery partition created by Windows 10 (usually about 500 MB) is not large enough to support the new Windows RE image (winre.wim) file, resulting in a 0x80070643 error when trying to install updates.

Foreign technology media BleepingComputer tested and used the latest ISO provided by Microsoft to completely install Windows 10 and create a 522MB WinRE partition.

Because the newly installed partition is too small, the KB5034441 security update cannot be installed and a 0x80070643 error is displayed.

The only solution currently offered by Microsoft is to create a larger Windows recovery partition so that there is enough space to install security updates.

Because the Windows recovery partition is created on the same disk as the C: partition, you must shrink the C: partition by 250 MB and use the new unallocated space to create a larger recovery partition.

Microsoft previously issued a support advisory describing how to shrink the C: partition by 250 MB and create a new recovery partition using the reagentc.exe and dispart.exe command line utilities to accommodate the WinRE security update.

IT Home Note: Reagentc.exe is a command line tool for managing Windows recovery environment, while diskpart.exe is a command line tool for managing device disk partitions and volumes.

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