Photoshop CC "Damaged or incomplete"

I downloaded photoshop but when I open it I get the message that it may be damaged or incomplete.  Creative Cloud won't let me reinstall.  Any advice would be fantastic. I've tried the direct download, but cannot access it, and I'm peeved that I'm being asked to set up another, free account, just to fix something that should "just work."

Also, Dreamweaver cc has "updated" every hour since I installed it, with no sign of stopping. I doubt that the team is pushing updates that fast.