> I have a two part question.
> 1) How do you install Linux without completely reformatting (and losing
> all old data) your computer?
You don't do the reformatting, full stop! You need one or two
free partitions on which to install linux, and distros come with tools to
make them if you don't have them, shrinking your old partitions to suit.
Quote:> 2) How do you create a dual-boot system so that you can choose which OS
> you want your PC to boot up?
In the normal way. Please read the instructions that come with your
distro of linux. It will tell you how to put both winodws and linux as
option sin th eboot loader.