When i start the Nehe OpenGL framework form Lesson 1 in fullscreen mode and then exit it, all other windows that i have opened are moved near the bottom right corner of the desktop. When i repeat this two or three times all the windows are with their bottom right corners out of the desktop. I use Windows 98 SE and Windows 2000 and this happens in both the operating systems. Is there a bug in the OpenGL basecode?

Try updating the video card drivers. What kind of card do you have? It might be that the screen isn''t going back to the original resolution...

Check out Lesson 28. It has an updated KillGLWindow function that corrects a problem with returning from fullscreen mode. It may solve your problem.