Well I hate to be the bearer of bad news but Turbocnc is about as simple as it gets.
Have you been to thier forum on Yahoo.
I am not sure what kind of problems you are having but if you break it down into simple steps and do one axies at a time you shouldn't have much problem.
If you go to thier forum you will find many people that are very familuar with the product.
In Turbocnc you are booting into DOs aren't you?
That is a mistake many people make they try to run it in a dos window. Also you are using an OS that had Dos, you can't run it from XP as far as I know nor NT and I don't think Win 2000.
I have only used the 3.xx versions not the 4.xx versions.