Got Hacked

I only wanna ask..

I got hacked with exchange dudes... and i change pw and all other thing like my email... But the hacker can get my pw whenever he wants! He dont send me a file where could be a keylogger or such a thing!!

And i know that THIS person ahcked me ingame!

HOW CAN I MAKE HIM DONT GET MY PW AGAIN?? :(

Reinstall your system and use a firewall and antivir tool. And change your password again.