Hello everyone

i stared this one to help my little brother(11 years old) when he want to login on his hotmail he gets this massage

"It looks like someone else might be using your account". and he needs this email for his school, and want to go on skype with his friends, i tried everything, i did the password reset like 4 times, filled in alot of qeustions, but it still doenst work, can someone please help me little brother out, thanks

(sorry for the bad english)