Here is a quick hack for using opencv and python 3.4 on a Windows 7 PC.
Simply follow the steps below: 

install python 3.4
to use pip : go to the system variables and click "new". name the variable "pip" and the path should be the path to your "python34\Scripts" folder.
install numpy 
enter "pip install numpy" into the cmd
download the right opencv version from
open cmd
enter "pip install *full path of opencv wheel" in the cmd
start python (either the idle or in the cmd) and enter "import cv2"
if there is no error, the instalation was successful.