"If you have been using Windows for any length of time you will have acquired some expertise and probably built up a collection of files you don't want to lose, two reasons why you might think moving to Linux is going to be too much trouble. It isn't, trust me and read on...
"It is really quite simple to install two operating systems on a single PC, then use a piece of software called a 'boot manager' to choose which to load when you start the computer..."