Antivirus - if you have only windows defender, get something else.For example Avira Free: https://www.avira.com/en/download/product/avira-free-antivirus which also comes with Avira Browser Security
Spybot Search & Destroy - install free version and scan your PC once in a while https://www.safer-networking.org/mirrors24/
Dont click any links on skype you receive in private msg -noone is sending link out of nowhere, if you receive link from someone without any explaination and you arent expecting to receive it from that person from your past conversations - Dont click it.
Turn off in skype 'automatically accept incoming files'- Tools -> options -> IM settings -> show advanced -> on the bottom
Install AdBlock - (and remember to turn it off on your favourite youtube/twitch channels )
RSA security token - this is the best way to protect your account, however - remember to turn off pokerstars client when you are afk for longer periods of time. If you go on holidays/trip take the token with you.