Well C++ is easier written in Linux so you can decompile it using g++. You can get some good ISO's for Linux at www.LinuxISO.org
Once you have it installed, it should have taken a short 30 minutes, you should open Gedit and insert in:
int main ()
cout << "Hello World!\n";
then save it to your desktop and call it hello.cpp then open your terminal and put in
g++ hello.cpp -o hello
then when it's done put in
should come up.