Ok yes i am a total newbie and this maybe a stupid question but i shall ask it anyhow.

I am finding it very hard to find tutorials on how to crack a programs code. I would like to know if you can reverse a program to its original code eg. C++ . I have a program that i would like to change a few things in but i can only change it to hex using windasm from the information i have found so far. Is there a program to do such things ???