There have been a few comments pointing out that C is not C++. While that's true, also true that any C++ compiler will also compile C - usually the compiler mode will be automatically selected based on the filename extension, but every compiler also has an option to force C or C++ mode regardless of the filename.
So choose the free C++ compiler that you're most comfortable with gcc, VC++ Express, Digital Mars, whatever. Use the IDE you like best emacs, vim, VC++ Express, Code::Blocks, Bloodshed - again whatever.
Any of these tools will be more than adequate for learning. Personally, since you're asking about Windows, I'd choose VC++ Express - it's a great IDE, it's free, and it'll compile C programs just fine.
