Symantec Backup Exec Unable to delete ese.dll in B2D folder

Ese.dll has a filehandle or lock on it by WMI. THe following Pre and POST commands solved it for us (without the quotes): "taskkill /f /im wmiprvse.exe". This would allow a B2D to delete the previous IMG000XX folder that would normally only contain ese.dll, which could not be deleted manually via windows explorer. Not sure if this is caused by Backup Exec WMI Provider or Windows OS WMI Service.