"No Disks have been mounted" error in Veeam while restoring guest files in Windows

While restoring guest files of Windows systems in Veeam (LFR restore), you may get the following error:

No Disks have been mounted. Either disks of this type aren't supported or some error occured. See log file for details.

This error might be connected to the Symantec Backup Exec installed on the same server as Veeam Backup & Replication. Also interesting, that this error occures only for LFR restore, other types of restore are not affected.

There are two possible solutions for this issue.

Solution 1

1. Start Registry Editor.
2. Go to the following key: "HKLM\SYSTEM\CurrentControlSet\Services\FsDepends".
3. Under the "FsDepends", change REG_DWORD value "Start" from "3" to "0".
4. Restart the server.

Solution 2

1. Start cmd with elevated permissions.
2. cd "C:\Program Files\Veeam\Backup and Replication\Backup"
3. vdk remove
4. vdk install
5. Restart the server.