My internet connection at home has been terminated


But this means I cant play GCCG on the desktop, so I have copied all the files across to the laptop. However, when I ran it for the first time it asked me to enter user. I put in my username, but then it said already in use and threw up an error. Now I cant get in, each time it just says it has a server error as the name PaulGrogan is in use, and I cant seem to change it to anything else.
Q1: Should I be able to play on 2 different computers with the same name?
Q2: Now that I seem to have screwed up my install on the laptop, how can I fix this to clear the username I had set.
Thanks all
Paul