KB2656356 Failed to install error code 800B0100 ***FIXED***

Hi I am having trouble installing KB2656356 on windows 7 x64 ultimate edition with SP1 (64bit)

I have tryed the,       (manual downloads)

Windows6.1-KB947821-v20-x64_(System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [February 2012])




sfc /scannow  (command from cmd prompt) this gave me an error "Windows Resource Protection found corrupt files but was unable to fix some of them."

"Details are included in the CBS.log windir\Logs\CBS\CBS.log"

but I am unable to open the log file at Windows\Logs\CBS\CBS.log as it says I don't have permission to open this file

net stop cryptsvc (command from cmd prompt) and renaming catroot

before doing these I tryed to uninstall the net 3.5.1 from windows components restarting and reinstalling (that worked and it let me install one update to dot.net before I got the failed error message again on this update)

here is a copy of my windows update history log (could not figure out how to copy it from the displayed page)

windows first update is on 8/4/2010, first failed update is on 8/6/2010 for KB979916 (this update did install on 9/22/2010)

kb2656356 first failed on 2/5/2012 again on 4/5/2012 and again on 4/6/2012, 4/12/2012, 4/12/2012, 4/13/2012, 4/18/2012

I am trying to resolve the system file checker errors first and will be posting when that is fixed

(ran a disk check that fixed errors and then did a sfc in safe mode and got a 100% no error message) but still cant install the update (but the maunal update said it installed but the windows update said failed 2 min later grrr)



going into <Control Panel> and <Programs> then <Turn Windows Features On or Off> and unselecting the check box for <net 3.5.1>, restart as asked and go back and recheck the box to reinstall it and restart (I know it wont ask you to but do it anyways),

install .net update (with a CRTL+ALT+DEL and a end process on both core/optimizers for .net) then immediate restart

do this again and this time it installed the KB2656356 (there was one update for .net before the KB2656356) restarted and now no more windows updates.


now to fix my Age of Empires Online error

Thanks, Wes

PS if I did not CTRL+ALT+DEL the net framework optimizers would run for 2~15 min and that is my guess why I could not install the update as the files were in use by the optimizer


Question Info

Last updated December 21, 2017 Views 799 Applies to:



Please follow the methods listed below.


Method 1:

Step 1: Place the computer in clean boot.

Use the link mentioned below


NOTE: After successfully installing the update, revert the computer to start as usual (Refer step 7 from the link mentioned above)


Step 2: Manually try installing the updates from Microsoft Download Center.

a.    Visit the Microsoft download website, type the "KB" number of the search box and press enter.

b.    In the list of search results, click the Knowledge Base (KB) article link to go to the download page. If there's more than one listing, look for a link that goes to the Microsoft Download Center.

c.    If there are multiple versions on the download page, find the appropriate one for your computer. Click on the Download button, and save the update to your desktop.

d.    When prompted, click on Open to install the update.


Microsoft Download Center



Method 2:

Follow the steps from the link mentioned below.




Also refer to the link mentioned below.


Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.