FreeSoftwareTools.net

Q-Dir is a quad-panel file manager that is capable of displaying four Explorer Windows simultaneously.

Q-Dir is a good file manager with an amazing Quadro-View technique.
Supports Drag and Drop, all Views, and other functions of your system.
It does not have to be installed and can be executed easily from the desktop, and can be carried on a small usb-stick or other memory device.
If you find the quad panel mode strange or you are unfamiliar with it you can always enable the classic two panel mode.
Q-Dir has an Unicode version and a 64 bit version.