I personally use Ubuntu. Get the GUI - not any of the server options. Ubuntu is generally the most friendly. You can try Mint, Debian, Red Hat (may have to pay), or Kali (mainly for ethical hacking). But Ubuntu is the most friendly version. It is easy to install as a dual-boot in your OS.
I agree, other than just burning/moving it to a USB, I always found Ubuntu to be the most straight forward and friendly Linux distro.