You're going to lose about 15-25, at least, to run Windows 7, so leave yourself plenty of space for Mac OS, too. Make sure you have plenty of hard drive space, at least 40 or 50 gigabytes on your Mac.Here's how to install it on your Mac in a few simple steps: Fast, pretty and without a single crash so far (knock on wood).Ī step-by-step guide to installing Windows 7, after the jump. I never thought I'd say this about a Windows operating system again after refusing to upgrade from Windows XP, but from what I've seen so far, Windows 7 is. My Macbook, which is two years old, runs it like a champ as a Boot Camp partition. Best of all, it works perfectly well on newer Macs sporting Intel processors. Over the weekend, I installed Windows 7 RC, a free, preview version of Microsoft's forthcoming operating system, the successor to Windows Vista.