Article ID: 937426 - View products that this article applies to.
After you start the computer in diagnostic startup mode, you are prompted to activate Windows Vista even if you have already activated it. If you do not activate Windows Vista again, the system is considered non-genuine. Therefore, Windows Vista runs in reduced functionality mode.
This problem occurs only in diagnostic startup mode. When you restart the computer in normal startup mode, the problem does not occur.
Note The activation prompt does not necessarily mean that you are using a non-genuine copy of Windows Vista.
This problem occurs because the Windows licensing component depends on the "Plug and Play" service. The "Plug and Play" service is disabled in diagnostic startup mode.
After you apply this hotfix, the "Plug and Play" service is not disabled in diagnostic startup mode.
Service pack informationTo resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/935791/ )How to obtain the latest Windows Vista service pack
Hotfix informationA supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
PrerequisitesNo prerequisites are required.
Restart requirementYou do not have to restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any other hotfixes.
File informationThe English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Windows Vista, 32-bit versions
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Windows Vista, 64-bit versions
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.
Diagnostic startup modeWhen you start the computer in diagnostic startup mode, the system loads only basic devices and services. This configuration can help you troubleshoot problems that are related to devices and services. To start the system in diagnostic startup mode, follow these steps:
Normal startup modeTo restart the computer in normal startup mode, follow these steps:
Reduced functionality modeIn reduced functionality mode, you have only limited access to Windows Vista programs and features. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/925582/ )The behavior of reduced functionality mode in Windows Vista
Article ID: 937426 - Last Review: October 8, 2011 - Revision: 4.0