Make sure that you have a
4GB (minimum) USB stick. Make sure that you are allowed to boot your laptop
from a USB stick. Go to http://sourceforge.net/projects/openfoam-extend/files/
and download a iso file of your choice (LiveDistributions/OpenFOAM_kubuntu)
Unpack it on the stick. Make it bootable: If you are running Linux, go to the
boot directory on the stick, using a terminal window, and type "sudo ./bootinst.sh" (bootinst.bat in Windows).
See further instructions at
(for instance): http://www.cfd-online.com/Forums/openfoam-installation/76345-openfoam-dev-live-usb-dvd-based-kubuntu.html.
With this alternative you will be running Ubuntu from
the stick, so you will have full access to all the functionality in Linux. OpenFOAM is then also installed.