Those who are using windows 8.1 & have their windows update turned on must read the following article :
so,i suggest if u do have windows update enabled & installed the 15 th august update . please go to control panel>programs>program & features > installed update.
find the following update code: KB2982791 and KB2975719
& right click uninstall immediately. remember if u r wonder u have them installed & having no problem be advised that it will trigger the black screen of death a.k.a boot failure after 2 successful booting of windows .
i hope no one is too late to do this