Incorrect Password (cd:260) Except on one comp.

[[SOE]No.Mam]

Does the cd key only work for one computer?

no. CD-Key from game is locked with y loginname.
possible y use wrong loginname or password.

copy y MoW-profile files from old pc to new pc.

y will find this files in:
....my documents/my games/men of war... (version 1.02.. till 1.13.4)
...my documents/my games/outfront2... (version 1.16.4)

copy this 2 folders to new pc (same folder).