Ragnarok Online in Vista

Hey, I don’t really know where i should leave
this question – so, here goes.

I’ve had a desktop all this while with Ragnarok
Online running fine on it. I’ve copied it
multiple times to other locations (compters)
without problems. I got a new laptop and wanted
to transfer it there and I did. Now, when I try
to start the client, it starts up and then
disappears. It hasnt really closed since i can
still view the server under Processes in the
task manager. Anyone got any clues on how i can
resolve this?