Two users accounts that are logged on to the same computer cannot use Windows Photo Viewer at the same time in Windows 7, Windows Server 2008 R2, Windows Vista, or Windows Server 2008
Content provided by Microsoft
Applies to: Windows Server 2008 R2 DatacenterWindows Server 2008 R2 EnterpriseWindows Server 2008 R2 StandardWindows 7 EnterpriseWindows 7 Home BasicWindows 7 Home PremiumWindows 7 ProfessionalWindows 7 StarterWindows 7 UltimateWindows Server 2008 Standard without Hyper-VWindows Server 2008 DatacenterWindows Server 2008 EnterpriseWindows Server 2008 StandardWindows Vista BusinessWindows Vista Business 64-bit EditionWindows Vista EnterpriseWindows Vista Home BasicWindows Vista Home PremiumWindows Vista StarterWindows Vista UltimateMore
You have a computer that is running Windows 7, Windows Server 2008 R2, Windows Vista, or Windows Server 2008.
You enable the Fast User Switching feature or the Remote Desktop feature on this computer.
You directly log on to the computer. Or, you use a Remote Desktop session to log on to the computer.
You open an image file by using Windows Photo Viewer on this computer.
While you are logged on to the computer, you use another user account to log on to the computer by using the Fast User Switching feature or by using a Remote Desktop session.
You try to start Windows Photo Viewer by using this second user account.
In this scenario, you cannot start the Windows Photo Viewer. Additionally, you receive the following error message if you do not have the Administrator privilege:
Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item.
Note This problem does not occur if you use another application to open the image file, such as Microsoft Paint.
The issue occurs because the Windows Photo Viewer uses the Microsoft COM+ hosting process (Dllhost.exe). This process is configured to allow only one instance of itself to run on each computer.
Note This hotfix is only for Windows 7 and for Windows Server 2008 R2. If you are running Windows Vista or Windows Server 2008, see the "Workaround" section.
A 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 the problem described in this article. 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:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
To apply this hotfix, you must be running Windows 7 or Windows Server 2008 R2 on your computer.
To use this hotfix, you do not have to make any changes to the registry.
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
To work around this problem, use one of the following methods.
Click Start, type regedit in the Search box, and then click Regedit in the search results.
In Registry Editor, locate the following registry subkey: