Go to Google and search. You're probably not gonna find any platform specific tutorials, but just learn all you can about C++. This shouldn't be bad since you've had some experience with C. Then learn what you can about the Win32 API. Now I'm sure you're gonna want to be writing games. If that's the case, learn all you can about the GAPI or check out some of the libraries that are available. And of course you have to have the programming way of thinking. You can everything about everything language out there but if you cant think logically to implement it then it wont work out.
There isn't too much you cant find with google.
And btw...
For your first project, for the love of all that is holy, do not start out with a Super-Duper RTS game or a state of the art Xbox emulator for the PPC(

). Try something simple. Draw pictures. Make a screensaver (battery waster on a ppc though). Fractals. If youre really brave, a very simple animation, but really dont just jump in and start trying to write the next Snails.