I'm runnining home premium 64-bit on a desktop, and when I hold the windows key and hit tab, I get the 3D scrolling. I tried this on my laptop, and it didn't work. I attributed this to my laptop only running a 32-bit version of Windows 7. But then I tried this on a laptop at work running the same 32-bit operating system, it worked fine. So why is it only my laptop that it doesn't work?