does not connect second time

for a while the program when I enter my brother's PC on the first try without problems if I go out and try to return because I have to see if he finished his uploads teamwiver does not fit me anymore, I get the message "the program can not be used for commercial purposes buy etc .. "and just loading and endless without ever connecting, then I try to connect my brother in my pc is able to do it without problems and I ask him to make the change, just click it seems that goes but remains with the loading screen, with other pc this does not happen, and if my brother restarts I can come back without problems, but then the problem returns what I do?