You will have to purchase an installation disk:http://www.newegg.com/Store/SubCategory.as...erating-Systems
Find one that you like. The OEM version is cheaper, but you can only install it on one machine. I personally don't like Vista (including 64 bit home premium version). In fact, I purchased one desktop computer with Vista Home Premium 64 bit version about a year ago, and had to format the hard drive and installed XP Pro instead due to software incompatibility issues.
Or you can download Windows 7 Beta from the following link (It's a test version, but it is much faster than Vista and it supports most hardware and software supported by Vista):http://www.microsoft.com/windows/windows-7...a-download.aspx
You will need to use Internet Explorer and the .NET passport. And you will need to act quickly to start the download. It's ending in a few hours. But you will have a couple of days to finish the download once you have started the downloading.
Edited by czhang, 10 February 2009 - 06:45 AM.