I refused to do it, and then shortly after, WinPatrol began pestering me to allow an .exe file created around the time of said popup to be on Startup. I kept refusing it, removed it from the WinPatrol Startup list, and uninstalled Drop Box from my computer. Then I got a blue screen - something about crash dump and since then, can't start normally without getting a Drop Box setup message asking whether I have an account with them yet or not. When I fail to respond, I again get the blue screen and "shut down to protect your PC" message.
I'm thinking that the original pop-up asking about uploading my photos must have come from some malicious source and not Drop Box. Probably no matter what I clicked in it, I would have gotten this problem. If only I had just shut down the computer!
Virus protection has also been disabled in my Symantec business client window and I can't use its live update to fix the problem.
Does anybody know if some cracker/hacker (Sorry, good hackers!) is getting into PCs with a fake message from Drop Box?