My photosteam seemed to work until I installed IOS 8 on my Iphone. No pictures are that synced but maybe not related. Tried everything. I also got it working once and got 5 photos and then stopped and nothing seemed to help.
I finally got it working so may want to try these in reverse order as maybe not all needed. BTW I have Windows 7 Home Premium on 64 bit ASUS X53E
1 - removed Icloud with control panel
2- Downloaded and installed safari for windows
3- Updated ITunes to version 12 (latest), launched it and exited it
4 - Downloaded Icloud and ran install as admin
5 - Have all the apples exe run as admin Applephotstreams, ApplePhotoSteamsDownloader, ereporter, Icloud, Iclouddrive, IcloudServices,Icloudweb
6- Started Icloud and turned off the photo checkmark, applied it, and then shut down
7- Cut all photos out of my Photo Stream folder and pasted to a backup folder
8- Restarted Icloud and checked the photo box. Photos started downloadning and had all. New files added also worked.
Only after the last 3 steps did everything seem to work fine with no errors in log file. Even new photos get there.
I will now try to remove so of the items and reboot to see which of steps 1-5 really needed. Look for later post.