Issue: Windows updates failed to install with error code : 800F0831 in Windows Server 2012 R2 Reason: If any previous update is missing in the server then you will get the above error. To find the missing patch you have to check the CBS logs on the affected server and you will find the similar entries like below. 2017-05-10 10:09:45, Error CBS Failed to resolve package 'Package_514_for_KB3205401~31bf3856ad364e35~amd64~~6.3.1.4' [HRESULT = 0x800f0831 - CBS_E_STORE_CORRUPTION] 2017-05-10 10:09:45, Info CBS Mark store corruption flag because of package: Package_514_for_KB3205401~31bf3856ad364e35~amd64~~6.3.1.4. [HRESULT = 0x800f0831 - CBS_E_STORE_CORRUPTION] In my case it was KB3205401 missing on the server. hence request you to find out the correct missing package on the server and install it to resolve the issue Resolution: Install the missing patch and reboot the server. Post reboot try patching it will resolve the issue co
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