You apply update 948515 on a computer that is running Microsoft Virtual Server 2005 R2 Service Pack 1 (SP1). After you do this, you experience problems when you try to mount Virtual Hard Disk (VHD) files by using the Vhdmount.exe tool.

For example, if 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.