Very quick glance at the KB thing finds this:
2013-01-10 11:00:58:806 412 10e0 Report REPORT EVENT: {3F33EE9C-7949-4126-8C0F-C17AF54C5E69} 2013-01-10 11:00:38:767-0000 1 182 [AGENT_INSTALLING_FAILED] 101 {5EFEB43C-BECD-47B9-84AF-B36D161FC4C3} 201 80070020 AutomaticUpdates Failure Content Install Installation Failure: Windows failed to install the following update with error 0x80070020: Update for Windows 8 for x64-based Systems (KB2785094).
and:
2013-01-10 11:27:27:679 1020 71c Report REPORT EVENT: {6571237F-7CD6-4660-A84F-0E3DF7EA69BE} 2013-01-10 11:27:18:488-0000 1 182 [AGENT_INSTALLING_FAILED] 101 {BB6754B9-A376-45B7-820C-34D8605D4BA4} 501 80070020 wusa Failure Content Install Installation Failure: Windows failed to install the following update with error 0x80070020: Update for Windows (KB2785094).
2013-01-10 13:30:00:266 1020 1db4 DtaStor WARNING: Attempted to add URL
http://download.wind...0283587ce83.msu for file 7QrbRlawCrWlf3oPP74QKDWHzoM= when file has not been previously added to the datastore