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I got the above error when tried to configure the opencv with CMake under Windows7. Turned out that my AVAST anti-virus was blocking the generation and deleted the temporarly created binaries immediately.. just add the opencv folder (build, sources, etc - recursively) to exclusion list in settings.
Same applies to eclipse projects when you create a C or C++ project make sure that the folder is added to the exlcusion list otherwise you will get execution error (when running the binary from eclipse menu).
Hope it helps.