Today in class one of my teachers was using Windows 7 as your "main" operational system. He said "Windows 7 never crashed". So i decided to try it too in VirtualBox.
You have to access Microsoft Windows 7 page. Download the version you want to use. You will have to fill a form and then you will receibe a mail confirmation. When you confirm it you will be able to access a page with the link location and your cd-key.
Open your Virtual box go to "New", choose a name. Change the options to Windows, version Windows 7 (32/64). Create, set the memory size. Create a new Virtual HardDisk. (I used 15GB). Start it, choose the image file and start the installation.
(Installation is so easy, i will not comment it here.)
PS: I know I haven't published regularly in the last days, but I'm sick (flu) and I'm testing some stuff that take a lot of time like IPV6.