I am not computer literate so I took it for granted that Windows 7 and Internet Explorer 7are the same thing. What's the difference? Recently, I was unable to get into a site as a message kept popping-up advising that my server is out-of-date. It has Windows 7 but the site requires IE 9. Do I simply download IE 9 from a Microsoft site? Is it a free download? Thanks; it's confusing.