Dec 28, 2008 Windows 7 Beta Build 7000, running under VirtualBox in Windows Vista. Displaying startup in virtual environment. Using latest ISO file found online: 7000.0.0clienten-usUltimate. February 9, 2009 So you want to install the Windows 7 beta on your IdeaPad S10, or another netbook without an optical drive. A Google search will turn up hundreds of guides, but we've read nearly.
UPDATE: You can download the RTM versions of Windows 7 Ultimate, Professional, and Home Premium here (64/32-bit available.)
The links to the ISO files are up again. Get your downloads below (this image gives you a 30-day license trial — learn how to get your key here):