This isnt an authoritative answer Ive just had this problem, sifted through the initial bogus media coverage, found a solution, and started speculating on the real cause. Heres a workaround for the problem, though this company mis diagnosed the problem it wasnt an ACL problem. This fix is opaque and comes from a third party, but it fixed the problem for me http www. Black Screen woes could affect millions on Windows Vista and XP. Note their fix is an exe and they dont tell you what it does. I appreciate that they are helping, but they should fully disclose their fix so at least advanced users can have confidence in their good intentions. Heres a better possible reason for why the problem occurred a registry key telling Windows which shell to run on login was corrupted a REGSZ key was missing a 0. Sounds somewhat plausible, but the fishy part is what caused that http www. Windows Black Screen Root Cause. My symptoms observations I ran into this problem on a Win. Windows Vista Ultimate. I log in, get a black screen, and Windows never proceeds to setting up my desktop, etc ie, Windows never launches explorer. Running the fixing tool from Prevx did solve the problem, however their diagnosis for the cause of the problem was wrong their initial hypothesis was the ACLs were incorrect and implied Windows Update patches broke it, but that was wrong. They followed up with the non null terminated string hypothesis. Before running Prevxs tool, the registry key existed, Reg. Edit visually displayed the expected value explorer. ACLs were fine.   Yet, of course, I couldnt successfully log in. My pure speculation about the cause So if the missing 0 hypothesis is correct, and if the Prevx tool deletes recreates the value in the registry key, obviously that should fix the problem. FYI look at the MSDN docs for Reg. SummaryExplains how to use the Office Customization Tool OCT to customize Windows Installerbased Office 2013 installations. Microsoft Toolkit 2. PC to license the software like Windows and Office Activator. Usually, you have to purchase the activation. Office 2010 Toolkit is greatest and high activator till 2017. This toolkit Office 2010 and older CODYQX4 Bosh in the following all of the activator. Office 2010 Toolkit and EZActivator 2. Download http Office 2010 Toolkit and EZActivator multifunctional activator Office 2010. Set. Value. Ex for a note about the lp. Data parameter needing a 0. But that doesnt explain how the value got messed up in the first place  I dont go around removing terminating zeros from REGSZ values for fun nor profit. Sounds like either random corruption, or more likely, something wanted to run something when Windows boots then incorrectly undid their change to the registry. I saw that some MS security folks suggested this could be caused by malware http blogs. Operating under that hypothesis, I ran Forefront on Wednesday using the current signatures, but it didnt report anything. That may not spot a novel virus or rootkit, of course. Another wild guess perhaps the act of installing certain classes of patches could cause the problem, due to a hypothetical bug in Windows Update. Windows Update does something on boot up to configure patches, and it looks like this happens after login but before Explorer is running. Perhaps Windows Update itself could be editing this registry key to replace the shell with another program that configures patches or options to explorer. If thats how it works which is a big guess, then maybe when WU restores the registry key value to explorer. Win. 7.   Of course, I would have expect to see a bad value for this reg key in Reg. Edit if this were the case. I didnt perhaps there were some unprintable characters in the string, or Ive empirically shot down my own wild guess. Note my problem occurred on a Windows 7 Ultimate machine that was upgraded from Vista Ultimate. Perhaps something during upgrade may have introduced some registry corruption that didnt show up until another value in the registry was changed later  BTW, to confirm the fix narrow down this fix, perhaps someone w a broken machine can reboot into Safe Mode, run Reg. Edit, delete HKEYLOCALMACHINESoftwareMicrosoftWindows NTCurrent. VersionWinlogonShell then recreate the Shell key as a REGSZ key, with the value explorer. If that works, that could help confirm the cause and allow us to give standalone instructions for a fix that we can have more confidence in as opposed to telling people to run an exe from a third party. Cisco UCS and Application Delivery for Microsoft HyperV Virtualization of Exchange 2010 with NetApp Storage. Microsoft Office 2010 language packs enable people to convert the display language of Microsoft Office 2010 to the language of their choice. The language packs also. Download Microsoft Toolkit 2. For Windows and Office Activator Official KMSpico. Microsoft Toolkit 2. PC to license the software like Windows and Office Activator. Usually, you have to purchase the activation key for licensing of the software but is costly, and not affordable by every person. Microsoft Office 2017 Product Key is the modern tool. Released nowadays with a lot of advance option. Setup is the released week ago to maintain the office authority. Before you begin Did you redeem your product key and associate Office with a Microsoft account Not every purchase of Office includes a key, but if this is a new. This activator can activate any version of Microsoft Windows and any version of Microsoft Office, including Microsoft Office 2016 RTM Professional. Microsoft Office 2010 Fully Activated' title='Microsoft Office 2010 Fully Activated' />So, it is free and simple tool use to activate the window. It is supportive for all version of the Window like 7, 8, 8. MS Office 2. 00. 7, 2. It not only activates this product but also increases the speed of the system. 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Then you will get the activation key from the Microsoft for the Windows and Office products. Microsoft Toolkit 2. MS office. Many other tools are also available over the internet that provides the fully activated window and office but they only work when you are disconnected from the internet. But Microsoft Toolkit 2. Note When you start the Microsoft Toolkit 2. When you click on it then the activation process starts and after the few moments, a notification will appear that your window or office has been activated.