If it's your modem/router and a shared network and all participants are known and trusted, ok.
If it's a public wi-fi system or open wi-fi system, keep it simple by using internet viewing only. Don't go to your banks, broker accounts etc, anywhere where you log in with an account, a user name and a password. They can be hacked.
If some one is actually 'on' your computer, you've been hacked and need to get the bad stuff off. Worst is a program that records your keystrokes and then calls 'home' to the bad guys with a file of your entire session including any log in names and passwords.