With linux you can't run Advanced Windows Care or Kapersky. They're Windows programs. I've tried a 'live' disc but found linux is not for me (not enough time to study it). Using the disc as 'live' means you boot from the downloaded disc and use it live and NOT installed on your PC. This will give you a chance to see how Linux works. Remember to change the boot options to CD first.
Download the appropriate disc image and burn the image on to a dvd disc.
Whatever you decide be very careful what you do.
http://cdimage.ubuntu.com/dvd/current/