I am able to get connected and I am a Windows 7 User (32 Bits). (I did nothing to GameGuard, no GGK no nothing)
Maybe is not the GG Killer you used, maybe your missing the address you have to add to short cut. (Check main Pintos website.)
Here is how to do it, once you have it full downloaded, go to the game´s main folder (the place you installed it), then find a Yellow star icon, right click it and create a short cut to your desktop or another place, then select the shortcut you created and right click it.
Select the short cut tab and you will see a space that says Target: "C:\Program Files\(folder)\Athens.exe"
You will have to add the next address: -i 188.138.32.207
So the target will be as this:
Target: "C:\Program Files\(folder)\Athens.exe" -i 188.138.32.207
Then save and you are done.