Buy OEM and save
Jan 30
You don’t get a shiny box with the logo on it, the useless manuals and advertising inserts, but it is the real deal, a fully licensed copy of Windows Vista. So what is OEM?
OEM simply means that it is meant to be installed on one computer, if you sell that computer, your license should be included in the sale, once you install an OEM version of Windows it cannot be transfered to another computer.

You can find Windows Vista OEM version here
This is also available for Windows XP OEM version here