This has not happened before. I have a Windows 7, 64 bit laptop, and the photo stream button and it's associated options button cannot be selected.
I have uninstalled & re-installed iCloud about 3 times now, ran Malwarebytes, emptied out all photo streams on iPad & iPhone. What should I try next?
The way it worked for me was I went to control panel and uninstalled icloud and itunes, restarted pc and went to the apple site and downloaded icloud and itunes.
I found a simple fix in Windows 7 - 64 bit. Go to control panel, programs, iCloud, change, repair. That did the trick.
Retrieving data ...