Not sure if it helps but the DVD/CD that came with my CNC also included a config file that needed to be added to a folder in Mach3 (along with the good old pirate mach3 that everyone should ignore). I would hit up the reseller and see if they can provide that file digitally .
PS, if you are very new to Mach3 please also note that the reset Button is activated by Default (the Stop switch on the machine may be as well) so make sure those are also both off. If they are off then you should be able to move the machine with the arrow keys. (Get a Xbox 360 controller , makes life a lot easier, just make sure to read the setup guys as there are several setting that need to be changed before it will work as well).