Thank you for your forum post.
I believe this topic is posted into the wrong forum.
The error you are experiencing has nothing to do with both SQL Backup or SQL Virtual Restore.
The error you are experiencing is from Windows and this event indicates that a file required by an application is missing.
ngWrapper.LogManager #13:Failed to load assembly Microsoft.SqlServer.SqlEnum
This file is a Microsoft dll file.
If you are running a 64-bit system, I would ensure that you have both a 32-bit and 64-bit versions of the SqlEnum.dll installed and the versions of the files match.
If this is one off occurence or occurs at the same time every day, ensure that there are no other processes running that would prevent access to the assembly or check Anti-Virus software does not have a lock on the file.