Microsoft is Investigating Claims Patches Cause Windows 'Black Screen of Death'

UPDATE 12/02 : Since this report originally ran there have been new developments that no longer point to Microsoft's security patches (KB976098 and KB915597) being the cause of the so-called "black screen of death" problem. Prevx, the company whose research many media reports were based on, conceded this point in an statement issued to its Web site late last night. PC World has published several updates to this story including: Microsoft: 'Black Screens of Death' Not Due to Patches, Microsoft: Don't Believe the Black Screen of Death Hype, and Black Screen of Death: A Lesson in FUD.

(Original report follows)

Microsoft today confirmed that it is looking into reports that November's security updates have triggered a black screen on some Windows users' PCs.

"Microsoft is investigating reports that its latest release of security updates is resulting in system issues for some customers," said a company spokesman in an e-mail Monday. "Once we complete our investigation, we will provide detailed guidance on how to prevent or address these issues."

The reports Microsoft alluded to stemmed from U.K.-based security vendor Prevx, which claimed last Thursday that the Windows security updates issued on Nov. 10 changed Access Control List (ACL) entries in the registry, preventing some installed software from running properly. The result, said Prevx, is a black screen , sometimes dubbed "black screen of death" in a sop to the "blue screen of death" that Windows puts up after a major system crash.

Prevx added that security software seemed to be especially affected.

Although the Microsoft spokesman said the company would provide additional information once its support and security teams complete their investigations, it was unclear Monday exactly how extensive the problem was, or how many users were affected.

Searches of Microsoft's support forums today, for example, turned up only one "black screen" thread with posts after the Nov. 10 security updates had been released. Four different users on that Windows 7-specific thread said that they faced a blank screen.

On Nov. 19, a moderator of the support forum suggested a workaround that involved starting another Windows Explorer (explorer.exe) process. Prevx essentially gave the same advice a week later when it told users with blank screens how to download a free tool it said would fix the problem.

Microsoft's November collection of patches addressed 15 vulnerabilities in six security updates.

Only one of the half-dozen updates included a known issue. According to the detailed support document for MS09-065, one of the month's three critical updates, customers running Windows XP and using an ATI Radeon HD 2400-series video card "may find that the computer does not start correctly."

Microsoft's next security update release is slated for Dec. 8.

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