Cannot install Dropbox
Trying to load Dropbox on to my iMac with Yosemite. I get to download and then double click Dropbox icon to install. The icon goes to the Dock and bounces back and forth finally coming to rest but that is it. It seems to be trying to load the installer???? You cannot then open Dropbox (is it really there I ask?) and you cannot close the App except by force. (Incidentally my Finder often will not open either.) Managed fine to install on my laptop. Help!
Apple mac desktop[