I won't rehash all the reasons you need a VPN (virtual private network) -- you can see them here. Just think of it as a must-have service if you're to access all the websites you're used to, and to continue doing business online with your bank back home. (It helps keep others from spying on you when you're using public WiFi as well.) For occasional, limited use, you can use a free VPN service like HotSpot Shield. Unfortunately, the free version serves ads and runs pretty slowly, so if …