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You apply update 948515 on a computer that is running Microsoft Virtual Server 2005 R2 Service Pack 1 (SP1). After you do this, you may experience some problems when you try to use the Vhdmount.exe tool to mount Virtual Hard Disk (VHD) files. For example, when you run the vhdmount /m VHD_file command or the vhdmount /p VHD_file command, you may receive the following error message:
The specified operation could not be completed as an unexpected error has occurred.
This problem occurs because the Vhdstor.sys driver is not upgraded successfully to version 1.1.623.0 after the installation of update 948515.
How to obtain this hotfix
The following files are available for download from the MicrosoftDownload Center:
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
To apply this hotfix, you must have one of the following prerequisites installed on the computer:
Virtual Server 2005 R2 Service Pack 1 (version 1.1.603)
Virtual Server 2005 R2 Service Pack 1 with KB948515.msp installed on your system
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The 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.
Virtual Server 2005 R2 Service Pack 1, x86-based version
Virtual Server 2005 R2 Service Pack 1, x64-based version
To work around this problem, follow the steps that are described in Microsoft Knowledge Base article 953482 to upgrade the Vhdstor.sys driver manually. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
953482 You experience problems when you try to mount VHD files by using the Vhdmount.exe tool after you apply update 948515 in Virtual Server 2005 R2 Service Pack 1
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about update 948515, click the following article number to view the article in the Microsoft Knowledge Base:
948515 Virtual Server 2005 R2 Service Pack 1 does not support Windows Server 2008, Windows Vista Service Pack 1, or Windows XP Service Pack 3
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates