Q: where are the photo's in icloud?

You can't view photo stream photos on icloud.com.  They can only be viewed on an iOS device or computer that is signed into your account with photo stream enabled.  To set this up on your PC, see http://www.apple.com/icloud/setup/pc.html.  Note: when you first enable photo stream on your PC you will only get photos from the last 30 days as older photos are no longer in iCloud.