thats very odd,  looks like your hostname has been corrupted among other things..

What you might try, is booting from the first mandrake CD, then at the prompt, type: rescue

and then follow the prompts, it will load linux on from the CD, with no root password, and then "optionally" mount all your partitions.

Once you are in, simply set a new root password by typing:
passwd root

and type the new password twice.

that should get you started.

regards

Franki