well, I think I've misdid something because it gets worse. I did a desinstallation of SS4, installed CCleaner, run a clean and then, install a fresh SS4. I've rebooted as it told me, and directly try a JP version. It crashs at starting. I've falled back to the french version (without apploc) and it crash the same way. In both case, MD is'nt connected. So, I've checked the registry and I've found out that the local is STILL japanese, which means ccleaner didn't clean the registry. So I'll desinstall SS4 one more time and try to force the registry cleaning by CCleaner. I'll edit this post when I'm done. Thanks again for the help Ishiyoshi