Linux is a bit different from other OS distributions in that you can get certain distributions that are configured to a specific purpose as well as generic standard offerings. If you just want something 'standard' then look at Ubuntu or better still Mint, which is a built up version of Ubuntu.

Try them and if you don't like them look at Suse or any other number of distributions. If you are just trying to see what it is all about there is VirtualBox which will allow you to set up a virtual machine into which you can install a Linux machine on top of a Windows installation, running both simultaneously. Ubuntu allows you to install itself on Windows almost as an application without the need of Virtual Box.

Like most consumer decisions, do your homework before you take the plunge and you will have fewer unpleasant surprises.