How to install Psychtoolbox (PTB)

How to install Psychtoolbox (PTB) for Windows 7? Brief...

1. Download and install the Subversion from http://www.collab.net/downloads/subversion
    Please choose the suitable version. U need to register to eligible downloading the installer.
2. Download and installl the PTB from http://psychtoolbox.org/PsychtoolboxDownload and follow the  
    instruction to install the PTB.
3. If needed, install the GStreamer SDK from
    http://docs.gstreamer.com/display/GstSDK/Installing+on+Windows to activate the Psychtoolbox Screen()
    mex file. If not the statement: Invalid MEX-file 
     'C:\Psychtoolbox\Psychtoolbox\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64'\
     will appear when run "Screen"command. 
   There are 3 set then. Download and run all.