Leak Test incorrectly shows my OS as Windows Vista when I have Windows 8

I am running Windows 8.1 and I have reserved for Windows 10 but here it shows as Windows Vista in the leak test. My system is constantly being hacked by strangers and they tease me by saying my gmail passwords. I have a weak router D Link 2520 U and I can’t able to upgrade its firmware. My Comodo Leak Test result is 220/340. Is this fair enough to defend the hackers? I was a victim of DNS changer virus too. My Leak test also shows as “Infosend : DNS Test : Vulnerable”.

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