Symptom
After an upgrade or service pack installation, configuring a Virtual Server Agent can produce the following error message.
Installer detected the driver already installed and is not able to recycle it.
7968 8044 08/06 02:53:45 Driver Service vstor2-mntapi20-shared already exists
7968 8044 08/06 02:53:46 Timeout waiting for service to stop(Start)
7968 8044 08/06 02:53:46 Setup failed to start Vstor2 mntApi 2.0 Driver (shared) service.
Cause
In setups where many installs and uninstalls are performed, the installation might not be able to patch and recycle an installed file level driver. In this situation, rebooting the system is required.
It is also possible that the vstor utility included with the VDDK is not in the correct directory or is not being found.
Resolution
To resolve this issue:
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Verify that the vstor2-mntapi20-shared.sys file is in the Windows\System32\drivers\ directory.
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Check the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\vstor2-mntapi20-shared and verify that the imagepath is set to Windows\System32\drivers\vstor2-mntapi20-shared.sys.
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From a command prompt, run the following commands to test whether services are starting and stopping correctly.
Net stop vstor2-mntapi20-shared Net start vstor2-mntapi20-shared -
Reboot the system and resume the install.