exception occured: invalid key

Hi, i've recently occured big problems with sublight. when i try to launch it, i'm stuck with a "exception occured: invalid key" (labelised: connexion problem). It was with win xp so i installed 7, same problem. I don't uderstand, everything working fine on this computer. With my laptop no problem.
I carefully checked and i've internet connection, Framework etc .
What can i do, your soft is sooooo helpful !