I'm not sure being as lean as possible is necessary with a 64Gb SSD. I have Windows 7 64-bit and all my hardware drivers on my boot disk and only using 22.4Gb. I have moved my Documents, download and temp files to another drive, and I install all my apps on another drive too so only Windows and drivers are on the boot drive. But still, there's nothing wrong with lean and mean! Especially if that is the only drive you have installed.