SYSinternal Help needed

I have TCPview installed and whois with the Microsoft SYSinternal Suite app, and when I right-click to use whois in TCPview my computer gives me an error: Cannot resolve names or use local names. I'm pretty confident my network has been hacked into, and I need this program to work, I've been playing video games between 2 steam accounts where I've been tracked into every match I enter. When I try to run the Whois command prompt it doesn't load.