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I manually check for updates in my windows 8.1 everyday, i started to avoid optional updates and i tend to avoid "suspicious" or unneeded updates after i researched them (e.g.KB2976978).
Updates i currently do not have installed:
Game has been crashing constantly, tried most fixes i could find around the steam forums and here with little to no effort. Added tech_support.zip and lastcrash-ns2.zip from the crashlog right after the crash.