battlefield 1942 prob

[liquids]

Ok i recently created a copy of this game using .bin and .cue files, during installation, i got 2 crc errors, saying that a .rfa file was different than one in the setup.cab or sumting, so i ignored it and continued the install. Once done i patched it( no cd) etc, but once i try to get on a server, it says invalid cd-key..and during single player, i cant see my weapons.../sigh

is there any way to get around this without buying the original...