Hi, i am quite new to opengl so i am doing the tutorials but i wanted to create a new project for every tutorial to keep everything organized and clear. So i did tutorial 1 which was great and am no ready to do tutorial 2 so i copyed all the code off tutorial 1 into an new project added the lib's for opengl so everything should work and try to compile it before to begin with the tutorial. Now everything compiles great but after i choose fullscreen or not it gives me an error with !RegisterClass(&wc) . How is this possible because it worked (and still works) great in the project of tut1. Hope you can help me. thanks btw i am using vs2005