Hi Tutan,
The problem here is that 'DLNA' has been turned on. This should be turned off. To do this, from the B2 front panel go to:
'Main menu' --> 'Settings' --> 'Maintenance' --> 'DLNA' -- select 'DLNA Off'
Then from 'Maintenance' --> Start NAS' (to ensure that NAS is still enabled)
Going back to the PC, if the B2 is showing in Win Explorer 'Netwok' probably as 'BRENNANB2', when you click on this icon to openit, you will be asked for a username (root) and a password (brennan).
Sometimes in Windows 10, a bit more might be required but if so just post back here and we'll help you out.
Regards.
Peter.