to change your hwid its hard. you need to download a cmd program like called Volume.cmd and use cmd commands. now i suggest just reinstalling windows its much easier trust me and it doesn't work honestly cause they also do ip at the same time ur hwid is banned. and even if you get around it they ban your actualy ip from the router (the main ip gateway of the network) trust me i am having this issue right now. i can only use my account i can't make another account or get nx.
if you are getting can't complete action due to suspicious activity its due to hwid and ip and mac and primary ip ban.