I've obviously done something wrong, just can't seem to find out what lol.
Other thing is that having set it all up I have closed mach3 down & re opened it a few times & each time I get the same wizard screen up asking me if I want to configure the plugin. If I accept I get the screen up for setting the com port & other bits. When I click ok I get a massage saying can't read value but if I click ok again I get the successfully installed message.