So, if you are curious and want to check out what XO looks like (picture gallery), as on a OLPC, then I would recommend downloading the ISO of the LiveCD, burning it onto a CD and rebooting your PC.
The VirtualBox binaries are available free of charge for personal and evaluation use. By downloading from the below links, you agree to the terms and conditions set forth by the VirtualBox Personal Use and Evaluation License (PUEL).