There's no specific way, but the best way is to turn off the Chat function. ie: Tools>Options>Chat & uncheck the optionn box for enable chat. I'm not so sure your tech guy is really in knowledge of p2p technology. But anyway, that's the best way to stop browsing.

By the way you should have firewall, antivirus, adware, & spyware apps alongside your computer always to protect you. On windows anyway. If you need any links to any just ask.