I have been having this "check your network connectivity" error for three months. I see that there are 165 pages long posts on this thread and nobody has ever achieved a good solution. The support pages tell you to disable the windows firewall. This is total ****. The only thing that you have to do is TURN OFF YOUR ANTIVIRUS PROGRAMME!!!!! For the ones who this solutioun worked for, HAVE GREAT FUN! And for the ones who didn't, I send my regards...