This might be a dumb question but if I have a a wireless modem device (Virgin Mobile USA) and a netbook with Wifi -- do I need to turn off the Wifi in order to be "safe" ?? Can other users or hackers hack into my system because I have both Wifi and a wireless modem device. I also, as an extra precaution, subscribe to Comodo TrustConnect Internet Cloud service. Is this a good way to protect myself? Please help!