Users of the Windows operating systems have been facing a rather strange problem over the last few days. The problem which was named the “Black screen of Death” left users with a totally black screen once they logged into their accounts. In a statement made by software firm Prevx, according to them, the black screen of death was possibly caused by a faulty security update in November. However, officials at Microsoft have said that the problem was not as a result of any faulty security update and it could be a malware.

In a blog post made by Microsoft, a malware like Daonol could be the root cause for problem like this and not the KB976098 and the KB915597 updates as claimed by Prevx. All known versions of Windows, including windows 7, Vista, XP and Windows 2000 were known to be affected by this malware and Prevx said they had come up with a fix for this.