PhotoStream on iPhoto

First let's get the technical specs out of the way.

There are two kinds of PhotoStreams: PhotoStream and Shared PhotoStream

PhotoStream: 

• iOS device on iOS 5.1 or later
• Mac with OS X Lion v10.7.5 or later and iPhoto 9.2.2 or Aperture 3.2.3 or later
• PC with Windows 7 or Windows Vista (Service Pack 2) and the iCloud Control Panel v2.0 or later for Windows
• Apple TV (2nd generation) with Software Update 5.0 or later

Shared PhotoStream:

• iPhone, iPad, or iPod touch with iOS 6.0 or later
• Mac with OS X Mountain Lion v10.8.2 or later and iPhoto 9.4 or Aperture 3.4 or later
• PC with Windows 8, Windows 7, or Windows Vista (Service Pack 2) and the iCloud Control Panel 2.1 or later for Windows
• Apple TV (2nd generation) with Software Update 5.1 or later

To Set up PhotoStream on your PC: http://bethsiphonetutorial.blogspot.com/2012/11/icloud-control-panel.html

To Set up PhotoStream on a Mac: http://bethsiphonetutorial.blogspot.com/2012/12/turning-on-photo-stream-and-icloud-on.html

To view PhotoStream on a PC: 

•  Make sure that PhotoStream is turned on in the iCloud control panel: 
• Go to Start
• Computer (May see My Pictures or Pictures in the Start Command) 
• Pictures
• Select Photostream


• Select PhotoStream Download folder
• Your PhotoStreams will show there. 

To View on a Mac: 

Open iPhoto

Select Photostream

All Photostreams (Shared and regular will show up)