The PCRaster package does not come with an automated Windows installer; you need set up the PCRaster software manually. First, the software packages necessary to run PCRaster Python models need to be available on your system, i.e. Python and the NumPy package. Second, the PCRaster package needs to be installed.
Installing Python and NumPy
The standard Windows installation does not include a Python environment. To run PCRaster Python models you need Python 2.7 (for Windows 64-bit) and the corresponding NumPy 1.8 package. You need to install them if these packages are not available on your system.
More experienced users can download and install Python and Numpy separately. First, download and execute the Python 2.7.6 Windows Installer (the download will start automatically after a few seconds). Then, download and install the NumPy 1.8 package available from this page.
After setting up your Python environment you need to unpack the PCRaster package and to adjust environment variables. The necessary steps are described here.