Ringfinger,
1/ NAV: uninstall the software with Revo Uninstaller (free download, google it). This software would help you to remove all the left-over and allow you to install a fresh copy of the NAV. Also, please make sure that you have latest .net framework installed. Check Windows Updates for this one. Some of the feature in NAV employ .Net framework.
2/ When you setup your NAS, you should give it a fixed IP address. This will be the address you would put in "Map Network Drive" such as \\192.168.1.xxx\foldername. Tick the box "automatic connect at log-on" if you wish to have it available every time you start Windows. Since "\\192.168.1.xxx" is the fixed address of your NAS hence you cannot rename it to something else. Another way would be to make a "shortcut" of this drive on your desktop, then it is possible to "rename" the shortcut to something you intend to.
3/ The "Auto" function of your NAS shall automatically detect if there is any network inactivity, it would shut-down the NAS, and vice-versa.
4/ Email Notification Setting; This works for me as I also use Gmail and I assume you are using IMAP, not POP3
SMTP: smtp.google.com
SMTP port no.: 465 (or 587 if 465 did not work)
authentication type: Login (SMTP-AUTH)
SSL/TLS setting: SSL/TLS
User Name: your full email address
Password: your password
Once you have set this up, try to send a Test Message to see if it work.
5/ Trash Box: You can disable it from within the Web Admin GUi of the NAS. With this enabled, every time you delete file(s) on your NAS, it shall be moved to the respective Trash box. You would have to empty the Trash box manually if you wish to permanently delete the file(s)
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Hope this help