- Zorin OS (not very customizable)
- ChaletOS (never heard of it)
- Robolinux (never heard of it - sounds interesting but maybe difficult)
- Elementary OS (one of the nicest looking OSes - not very customizable)
- Kubuntu (runs the Plasma destkop which I use but it can be buggy - I lost the ability to control my sound for about a month - then one update fixed it)
- Linux Mint (second in popularity with #1 being Ubuntu - Mint is very stable)
- ReactOS (never heard of it)
- Linux Lite (too lite imho - good for older PC)
- Pinguy OS (never heard of it)
- Q4OS (very classic windows look - I've never tried it)
Xubuntu and Lubuntu are fairly lightweight but not so much as to limit you and should run fine on your machine. Straight Ubuntu now runs Gnome desktop which isn't very customizable. A few from above are very windows looking but all pretty much work the same. Click a button and the menu pops up with all your programs. They all have a file manager of some sorts which work like Windows Explorer. Many versions of ubuntu/linux can be written to a USB thumb drive and run Live from the USB and you can also install it from that usb drive. The Live USB feature allows you to test drve the OS before installing. There's a couple of windows programs that will write the Live USB. PenDriveLinux is one, UNetbootin is another.
There's a few of them - below are all Ubuntu based
Below is all linux family
