Sorry if there is already the same topic as mine but i couldnt find it.

So... every day i play, get some gear and after long play i logg out many times fully loaded. And at the next day i logg in i dont have this gear anymore! or i appear with the gear but on the other side of map with half hp! And i think someone is playing at my account. Please help me to change my CD KEY cause i have no idea how do it.