No you won't need one since all the software goes through Nintendo, so it's safe EXCEPT if you are using illegal software on a hacked wii, but then it's your own responsability
Smart-phones technically do not need antivirus. You can install it if you need it.
No, your Xbox cannot get a virus. So, no need for antivirus.
yes we need to install antivirus apart from windows defender
Yes, you do need the Wii console to buy wii fit.
yeah they need it
Some features of Chrome need an antivirus. Some features need firewall access to open the application.
No
Simply download the installer for the antivirus, then run it. With some antivirus software you don't even need to install it!
Antivirus software will notice about the virus,malware,spyware etc
Yes, if you are concerned Crowcom has a list of Antivirus apps for your phone
yes you need a wii fit board to play wii fit
Yes, you need the wii fit balance board to play wii fit or wii fit plus.