Virtualization with virtual box works great for me,
you can get the software here:
Downloads - VirtualBox
and after installing it, you can get a pre-installed image of Centos
here or Fedora
here. Centos matches the RedHat advanced server version.
the images are ready - so just load them into the virtualbox software and startup the virtual server and your ready to go.
Good luck !
by the way - that's how i do all my testing when working from my windows desktop at home.