says my cd key is being used by Key42.mpq on east but lets me right on west ? ?

someone is playing with your cd-keys on us.west, you can try to kill process game.exe if its yours name of key

If another user has your cd key, then you won't be able to use it on the same realm at the same time.

If Key42.mqp is yourself, then check your task manager and delete the "game.exe"

how do i know if key42 is me or not ?

Is this cdkeys only from you?

Was that the name that you used when you installed diablo 2?