It's a program used to simulate a LAN connection over the internet. To me it's main use is playing online PC games that were downloaded with friends. We've been doing this with Soulstorm. After a bitch of a set up for us, now I'm trying to set it up for another friend and we've come across a problem that unlike the ones we've had, we can't find any info on it anywhere else. Whenever he activates Hamachi, his internet just outright dies. It will only work if the Hamachi driver is disabled. Now knowing that it requires internet to even work, it's apparent something is wrong but we can't figure out what. I was hoping that maybe somebody here was familiar with the program and possibly knows the fix? He's on XP if it matters.