dna 125 problems can anyone help?

i went to work the other day and it everything was fine but after work i couldnt get it started, so i pushed it home and saw that a fuse had blown, so i replaced it and everything was fine the i saw smoke coming from some wires so i quickly stopped the engine, and saw that some wires had melted and so has the fuse, so i tired i new fuse and everything started for a couple of seconds then the fuse just blew, anyone got any ideas what could be wrong? thanks