I cannot fix the 0800B0100 Windows Update error.

Hi,

You may need to reset the updates and run the SUR then rerun the Fixit. Be sure to reboot and
try the updates first.

Windows Update Error 800B0100
http://windows.microsoft.com/en-US/windows7/Windows-Update-error-800B0100

Error message when you try to use the Windows Update or Microsoft Update Web sites to install
updates: "0x800B0100"
http://support.microsoft.com/kb/956702

How do I reset Windows Update components? - a Mr Fixit
http://support.microsoft.com/kb/971058

Description of the System Update Readiness Tool for Windows Vista, for Windows Server 2008, and
for Windows 7
http://support.microsoft.com/kb/947821

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If needed you can get free incident reports however usually the above helps to solve this issue.

For Windows Updates - Free Incident Report

Go Here and Click -> Windows Update fails while scanning for, downloading, or installing updates
http://support.microsoft.com/gp/wusupport#tab3

For Security Updates you can get a Free Support Incident Report
http://www.microsoft.com/protect/resources/support.aspx

Hope this helps.

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Rob Brown - Microsoft MVP <- profile - Windows Expert - Consumer : Bicycle - Mark Twain said it right.