NIS false positive detect on 2 sw packages ?

I'm on NIS 22.5.2.15

I've been using Vdownloader (http://vdownloader.com/) and nirsoft NetworkTrafficView (http://www.nirsoft.net/utils/index.html#network_utils) for a while and recently NIS has killed them reporting the .exe contains WS.Reputation.1 (see attachment).

Is this true or a false positive ? If false, how do I fix it please ?

Thanks