My GDI program runs fine on Windows XP but on Windows Vista and 7 it looks pretty terrible due to the lack of GDI hardware acceleration. I recall reading an article a few y
CMemDC: http://www.codeproject.com/Articles/33/Flicker-Free-Drawing-In-MFC http://msdn.microsoft.com/en-us/library/cc308997(v=vs.90).aspx