windows 8 Update KB2761226 fails to install with error 80073712

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All other updates installed without any problem, only this one fails to install. My computer is properly connected to Internet. "Enable/Disable Windows Features" dialog works properly(I can add/remove functions to/from windows without problem).

I've tried the following fixes without success:

• run "sfc /scannow" : it found some minor irrelevant problems and successfully fixed them all;
  
• run the "windows update trouble-shooter": it reports that it found some problems("detected potential windows update database error 0x80073712" and "must repair windows update componets", both were marked as "fixed") and fixed them all, but all it actually did was clearing-out my "installed update" list without doing anything helpful;
  
• disabling all non-MS services using MSConfig.exe;
  
• run "dism /online /clearup-image /restorehealth": this one gives error 0x800f081f "Either the repair source was not found or the component store cannot be repaired.", I've tried to use the "/source" switch to point it to a install source([extracted ISO]sourcessxs) but didn't help either.
  

DISM log: http://aboyfg.sn2.livefilestore.com/y1moCa55aTdMwetCzhoATZkAKDJE38RCMjznD450FLov4tXF8azd_kGjs4Bjb_zVoHMdUuFVOA44UUjYywFzID6POWgMKMLtMH_/dism.7z?download&psid=1

 

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