I have 8 gig, about 5 gig free. Trying to don't run anything extra on a background, removed (most of the) staff that came preinstalled. However, with Windows 7 it's hard to have really small number of background processes.
I've just emailed you the metadata file.
The 64 bit version starts fine (60 fps) without the SavedGames folder (surprise ). So it does with only one (the latest) save - 60 fps on main menu, 25 fps on the map.