Are you running Mach3? Sounds as if you have been given a demo licence, not a full licence. That may be annoying but at least it is legal - these machines often come with a pirate version of Mach3 which is likely to be unreliable/broken.

If that is the case, then the answer is to download a current version of Mach3 and buy the full licence. If it is not Mach3, then that's not the answer!