This thread was deleted in the Forum Crash, but I am still very much lost.
As I said previously, I am a complete C++ novice. I recently downloaded Code::Blocks + MinGW per your suggestion. When I wrote the very first code and clicked Build + Run, it said "main.cpp - Debugger uses an invalid compiler. Nothing to be done."
I'm using Windows XP, and it's on my external harddrive. I downloaded Code::Blocks without the MinGW first, and the uninstallation failed about halfway through, since C::B was still open. I deleted the folder to finish it. Since then I have redownloaded C::B + MinGW and uninstalled and reinstalled twice.