I don't have numbers on hand, but I've seen them improve with something like http://www.skype.com/intl/en/download/skype/windows/downloading/ http://www.skype.

I don't have numbers on hand, but I've seen them improve with something like http://www.skype.com/intl/en/download/skype/windows/downloading/ http://www.skype.com/intl/en/download/skype/windows/download... (beware the download starts automatically) that informs users upfront about the installation process, security warnings they'll have to click through, etc. A fair number of people are petrified by the idea of spyware, and bail out of an installation when encountering normal warnings.