Windows Update: Error message when you try to use the Windows Update or Microsoft Update Web sites to install updates: “0×800B0100″

SUPPORT SOLUTION:
When you try to install updates from the Windows Update Web
site or from the Microsoft Update Web site, you may receive the following
error message: 0×800B0100.This issue occurs if Windows security .dll files are
registered incorrectly..To resolve this issue, use the following methods according
to the
specific Microsoft Windows operating system that you use..Method for Windows 7, Windows Vista or Windows Server 2008
2, ‘resolution’);
To resolve this issue, run the System Update Readiness Tool (Checksur.exe). To do this, follow these steps: Download and run the System Update Readiness Tool. This tool runs a one-time scan for inconsistencies that may prevent future servicing operations.For more information about how to download and run the Checksur.exe tool, click the following article number to view the article in the Microsoft Knowledge Base:947821
(http://support.microsoft.com/kb/947821)
Description of the System Update Readiness Tool for Windows VistaTry to install updates again.Note After you run the tool, the Checksur.log file is located in the following location: %systemroot%\Logs\CBS\ In a default installation of Windows 7 and Windows Vista, this file is in the following folder:C:\Windows\Logs\CBS.Method for Windows 2000, Windows XP, or Windows Server 2003
2, ‘resolution’);

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
3, ‘resolution’);
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. a.button { background: url(/library/images/support/KBGraphics/PUBLIC/cn/FixItButton.jpg) no-repeat 0 0; width: 139px; height: 56px; display:block; cursor:pointer; } a.button:hover { background-position: bottom right; } Fix this problem Microsoft Fix it 50652NotesThis 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
3, ‘resolution’);

To resolve this issue, 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?
3, ‘resolution’);
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
(http://support.microsoft.com/contactus)
.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
(http://blogs.technet.com/fixit4me/)
” blog or send us an email
(mailto:fixit4me@microsoft.com?Subject=KB)
message..

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