Microsoft account does not exist – Need help quickly ( did not access it during 365 days )

Hey everyone,
I need help : I tried to access my old ( very old ) hotmail account that I've created about 4-5 years ago, and that I have associated with a game account ( complicated stuff ) . But now I need to access the account, and of course, I have forgotten the password. So I try to reset my password, but then it says to me that it doesn't exist ! I really need help on this, please help me.
Thanks