I have some trouble installing OpenCV. I took the 2.3.1 windows superpack available here: http://opencv.willowgarage.com/wiki/. I extracted it to C:\\OpenCV and built it wit
Problem solved. For future records, the problem is solved by adding the folder where "opencv_core*d.dll" and "opencv_core*.dll" (where * is the version number), to your system path (see the "compile using visual studio" paragraph here :opencv.willowgarage.com/wiki/InstallGuide)