"change your new Ip-adress to your old computers Ip Adress. If that doesnt work, start over."
That will definitively NOT work. The savegames are stored locally on your computer. You will have to locate your savegame and copy it to the other machine.
Kind of original, but really annoying...
http://en.wikipedia.org/wiki/The_Typing_of_the_Dead
It'd be nice if the Ninjas from above had their texts below them and if the keystrokes would be registered faster.