I''ve recently changed from windows 98 to XP only to find that the project I was working on no longer runs correctly. Both computers run at 1024x768(think that''s right), and the program runs at 800x600. For some strange reason, in XP the program doesn''t change to 800x600 and stays at the desktop resolution, leaving about 1/3 of the screen(right and bottom) unused. I''m changing the res. in DirectDraw with this: lpdd->SetDisplayMode(800, 600, 24, 0, 0); Is there any reason why this wouldn''t work, or is the problem elsewhere?

I''m ashamed to say I never thought of the bpp as a possible source for the error. However, after reading your post, I made the change and it did the trick.

Thanks!