It seems that you linked to x64 dll's and lib's of opencv and trying to run it under x86 configuration of Visual Studio! Try adding another path to the environment variables to "opencvDIR/build/x86/vc10/bin" and check all the paths in: (Im assuming you are trying to run an x86 project)
Project properties > Configuration Properties >Linker > General> Additional Library Directories: should be something like: opencvDIR\build\x86\vc10\lib.
and
Project properties > Configuration Properties >Linker > Input> Additional Dependencies: should contain the appropriate lib file name, if you are in debug mode they should be with a "d" at the end of the file name(stands for debug) and without it if you are in release mode.
I would allso suggest creating a property sheet for opencv rather then linking in the project settings!