The router needs a desktop pc dedicated to it. On mine I have windows and mach3, nothing else. I produce the code on my office pc and transfer the files on a usb stick. Laptops do not run cnc routers very well because of timing issues with the laptops power saving routines interfering with the parallel port. There are usb cards that will get around this if you have no other pc available.

Try downloading a copy of cambam. This is a piece of software that you can use to draw your part, program the toolpaths that you want to cut and produce the g-code that mach3 needs. Cambam is available as a basic version that is free. This can do 2d stuff or if you want to do 3d stuff, download the paid for version. You get 40 free evaluation uses before you have to pay. If you are the type of person that does not turn their pc off then the 40 uses can last for weeks.