I encourage people who are wary of security flaws in Windows to investigate Linux distributions. The vast majority of these are free to the public and with a bit of research and trial & error, they are easily understood by most people. Linux is also more stable and more secure than Windows, it is made by code developers for the love of what they do.
A long list of Linux distributions can be found here: http://www.linux.org/dist/list.html
A long list of Linux distributions can be found here: http://www.linux.org/dist/list.html