My Dell originally had Vista on it and my Sony laptop had Windows Xp Pro. I was very unhappy with Vista and was looking forward to all of the advertised features of Windows 7 as well as figuring out the unadvertised ones. I upgraded my Dell XPS workstation first and it went fine, but took a couple of hours because I was performing an upgrade and not a clean install. After the upgrade from Vista completed, everything worked without any issue; I didn't need to update any drivers. My wife loves all of the entertainment features of Windows 7 like creating stories with pictures within the OS easily. I then installed it on my Sony laptop with 1GB of Ram and it runs better than I expected. The networking aspects of the OS are fantastic and setting up a home network is easy (no I do not work for Microsoft). It plays nice with my network and interacts beautifully with my Xbox 360. I couldn't be happier with Windows 7.