Microsoft said that malware was to blame for the software glitch that was causing computers to display the ‘black screen of death’
Some experts had initially suspected that a recent Windows security update could be to blame for the glitch, which causes desktop icons and the start menu to disappear from computers after users log on, leaving them with a black screen.
Engineers at software company Prevx said that the patch could have caused a glitch in the Windows system registry, leading to performance issues. The “black screen” crash appeared to affect computers running the most recent Windows operating system, Windows 7, as well as older platforms, including Windows Vista and Windows XP.

But Microsoft said that malicious software, rather than a security update, was the likely cause of the problem.
“We’ve conducted a comprehensive review of the November Security Updates, the Windows Malicious Software Removal Tool, and the non-security updates we released through Windows Update in November,” said Microsoft. “That investigation has shown that none of these updates make any changes to the permissions in the registry. Thus, we don’t believe the updates are related to the ‘black screen’ behaviour described in these reports.”

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