VMware Backup Fails with "Failed to mount the VM volumes" / VDDK Error 'Code 24307' (4036871)

From the 'Upgrade and Compatibility' section of the VMware Plugin Release notes, available at the URL below, it says the following regarding the driver that VDDK requires to mount the VM's:

            http://us-downloads.quest.com/Repository/support.quest.com/NetVault%20Backup/8.6.1/Documentation/Plugin%20for%20VMWare/2.1.58/Quest_NetVault_Backup_Plug-in_for_VMware_2.1.58_ReleaseNotes.htm

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VDDK uses a kernel-mode driver for mounting a virtual machine during file-level backup and browse operations. The Plug-in for VMware automatically starts a service for the driver when you install the plug-in, but it does not check if the service is running when you perform an upgrade or a reinstallation. For details on the error, refer to the Known Issues section. To avoid the error, do the following while upgrading from v2.x:

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** If v2.x has been removed from the NVBU Client:

1.)  Open the Windows Command Prompt.

2.)  To stop the service (if running), type:

            sc stop vstor2-mntapi10-shared

3.)  To delete the service, type:

            sc delete vstor2-mntapi10-shared

4.)  To verify that the service has been deleted, type:

            sc query vstor2-mntapi10-shared

5.)  Install the plug-in.

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** If v2.x is still installed on the NVBU Client:

1.)  Open the Windows Command Prompt, and type: :

            sc query vstor2-mntapi10-shared

2.)  If the drive service is found, type:

            sc qc vstor2-mntapi10-shared

            It should return the following output:

            32-bit NVBU Client - <NV_INSTALL_DIR>/dynlib/vddk/bin/vstor2-mntapi10-shared.sys

            64-bit System - <NV_INSTALL_DIR>/dynlib/vddk/bin/vstor2-mntapi10-shared-64.sys

3.)  If the binary path is valid and exists, then do the following:

            a.)  Install the plug-in.

            b.)  To verify that the service has started, type:

                        sc query vstor2-mntapi10-shared

4.)  If the binary path is not valid or does not exist, then do the following:

            a.)  To stop the service (if running), type:

                        sc stop vstor2-mntapi10-shared

            b.)  To delete the service, type:

                        sc delete vstor2-mntapi10-shared

            c.)  To verify that the service has been deleted, type:

                        sc query vstor2-mntapi10-shared

            d.)  Install the plug-in.

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This should help repair the VDDK kernel-mode driver and allow the virtual machine to mount.