Please copy the exact error message, because that does not look like any error message I've seen. Actually it sort of looks like the common error "Output argument "myOutput" (and maybe others) not assigned during call to yourFunction()" but since this is not what you said, we'll wait for the exact error so we don't waste effort suggesting a solution to a problem you don't have, even though we all know how to fix the error I mentioned.
Another possibility is that the DLL is a 32 bit DLL and you're trying to run it from 64 bit MATLAB. That won't work (in my experience) but you can run it from 32 bit MATLAB. You can have both 32 bit and 64 bit MATLABs installed on the same 64 bit computer.
Also, see the FAQ regarding not being able to run compiled code: http://matlab.wikia.com/wiki/FAQ#My_standalone_executable_won.27t_run_on_the_target_computer._What_can_I_try.3F
