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Error 0x800B0100 when you try to install Windows Updates or Microsoft Updates

Article ID: 956702 - View products that this article applies to.

Summary

When you try to install the latest updates from Windows Updates or Microsoft Updates, you may receive the following error message:

Error(s) found:

Code 800B0100 Windows Update encountered an unknown error.

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This issue may occur if the Windows security .dll files are registered incorrectly.

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Resolution

To resolve this issue, follow the steps in the following sections that apply to your version of Windows.

Windows 8 or Windows RT

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Method 1: Run the Windows Update Troubleshooter

To fix this, run the Windows Update Troubleshooter by clicking the Fix-It button below:

Windows Update Troubleshooter

Note: The Windows Update Troubleshooter may have text that is available in English only.

Method 2: Run the System Update Readiness Tool

Use the System Update Readiness Tool to resolve this issue. This tool will scan you computer for inconsistencies that may cause errors to occur. To run the System Update Readiness Tool, follow these steps:

Swipe in from the right edge of the screen, and then tap Search. (If you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search.)
Type command prompt in the search box.
In the list of results, swipe down on or right-click Command Prompt, and then tap or click Run as administrator.
In the Administrator: Command Prompt window, type the following commands exactly as they appear. Press the Enter key after each command:
- DISM.exe /Online /Cleanup-image /Scanhealth
- DISM.exe /Online /Cleanup-image /Restorehealth
To close the Administrator: Command prompt window, type Exit, and then press Enter.
Run Windows Update again.

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Windows 7

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The following text provides information about how to fix the issue. If the methods below do not resolve your issue, then proceed to the next step.

Method 1: Run the Windows Update Troubleshooter

Windows Update Troubleshooter

Note: The content contained in the Windows Update Troubleshooter may only available in English.

Method 2: Run the System Update Readiness Tool

To resolve this issue, use the System Update Readiness Tool. This tool will scan your computer for inconsistencies that may be responsible for the errors. To run the System Update Readiness Tool, follow these steps:

In the table below, click the download link that matches your version of Windows. If you're unsure of which version of Windows you are running, follow these steps:
1. Click the Start button, then type msinfo32 in the Search box. Click msinfo32.
2. Your version of Windows will be listed next to OS Name and your file type (x64 or x86) will be listed next to System Type.
Choose the appropriate language in the Change Language list, and then click Download.
When you are prompted to do so, click Run to start the installation.
Follow the onscreen instructions to install the System Update Readiness Tool.

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All supported x86-based versions of Windows 7	Collapse this imageExpand this image Download the update package now.
All supported x64-based versions of Windows 7	Collapse this imageExpand this image Download the update package now.

Note: When your computer installs the System Update Readiness Tool, the tool scans your computer for inconsistencies. Typically, a scan takes less than 15 minutes. However, the tool may take longer on some computers. Although the progress bar may appear to stop, the scan is still running and you should not cancel the update.

Note: In a default installation of Windows 7, the System Update Readiness file is in the following folder:
C:\Windows\Logs\CBS

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Windows Vista, Windows Server 2008, or Windows Server 2008 R2

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To fix this, try the method below. If this doesn't resolve your issue, proceed to the next step.

Method 1: Run the Windows Update Troubleshooter

To start the Windows Update Troubleshooter, click the Fix-it button below:

Windows Update Troubleshooter (English only)

Note: The Windows Update Troubleshooter may have text that is available in English only. After the Windows Update Troubleshooter is complete your previous Windows Update history may be deleted.

Method 2: Run the System Update Readiness Tool

Use the System Update Readiness Tool to resolve this issue. This tool will scan your computer for inconsistencies that may cause errors to occur. To run the System Update Readiness Tool, follow these steps:

In the table below, click the download link that matches your version of Windows. If you're unsure of which version of Windows you are running, follow these steps:
1. Click the Start button, then type msinfo32 in the Search box. Click msinfo32.
2. Your version of Windows will be listed next to OS Name and your file type (x64 or x86) will be listed next to System Type.
Choose the appropriate language in the Change Language list, and then click Download.
When you are prompted to do so, click Run to start the installation.
Follow the onscreen instructions to install the System Update Readiness Tool.

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Operating System	Download Link
All supported x86-based versions of Windows Vista	Collapse this imageExpand this image Download the update package now.
All supported x64-based versions of Windows Vista	Collapse this imageExpand this image Download the update package now.
All supported x86-based versions of Windows Server 2008	Collapse this imageExpand this image Download the update package now.
All supported x64-based versions of Windows Server 2008	Collapse this imageExpand this image Download the update package now.
All supported IA-64-based versions of Windows Server 2008	Collapse this imageExpand this image Download the update package now.
All supported x64-based versions of Windows Server 2008 R2	Collapse this imageExpand this image Download the update package now.
All supported IA-64-based versions of Windows Server 2008 R2	Collapse this imageExpand this image Download the update package now.

Note: The System Update Readiness Tool scans for inconsistencies in your computer while it is being installed. Typically, a scan takes less than 15 minutes. However, the tool may take longer on some computers. Although the progress bar may appear to stop, the scan is still running and you should not cancel the update.

Note: In a default installation of Windows 7 and Windows Vista, the System Update Readiness file is in the following folder:
C:\Windows\Logs\CBS

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Windows 2000, Windows XP, or Windows Server 2003

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To have us fix this problem for you, go to the Fix it for me section. If you prefer to fix this problem yourself, go to the Let me fix it myself section.

Fix it for me

To fix this problem automatically, click the Fix it button or link. In the File Download dialog box, click Run and then follow the steps in the Fix it Wizard.

Fix this problem
Microsoft Fix it 50652

Notes

This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem. Then, go to the Did this fix the problem? section.

Let me fix it myself

To fix this, register the Softpub.dll, Wintrust.dll, Initpki.dll, and Mssip32.dll files. To register these files, follow these steps:

Click Start, click Run, type cmd, and then click OK.
At the command prompt, type regsvr32 Softpub.dll /s, and then press ENTER.
At the command prompt, type regsvr32 Wintrust.dll /s, and then press ENTER.
At the command prompt, type regsvr32 Initpki.dll /s, and then press ENTER.
At the command prompt, type regsvr32 Mssip32.dll /s, and then press ENTER.

Did this fix the problem?

Check whether the problem is fixed. If the problem is fixed, you are finished with this section. If the problem is not fixed, you can contact support at: http://support.microsoft.com/ph/6527
(http://support.microsoft.com/ph/6527)
We would appreciate your feedback. To provide feedback or to report any issues with this solution, please leave a comment on the Fix it for me blog or send us an email
(mailto:[email protected]?Subject=KB)
message.

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