Flash drives/ pen drives/ dongles - those things you stick in a usb port are very useful; 4GB storage is common and cheap now.
However, with most programs it's no use just saving the folder that seems to have the files as most programs edit the registry so you need to save the installation file(s), usually the setup.exe file that you started with originally, or download the up to date version from the web, or use the original installation cd.
Code downloaded to my PC will be deleted in due course.
WIN7; IE9, Firefox, Opera, Chrome and Safari for Windows; screen resolution usually 1366*768.
Also IE6 on W98 with 800*600 and IE8 on Vista 1440*900.