Re: File Size?
I upgraded to Windows 8 from XP. No liking the new GUI, and wanting something more XP-like, I installed Start8 from Stardock (I paid $4 for it). This made Windows 8 much more familiar and pleasant to use. It's very fast, even compared to Windows 8 - so I now think it's the best Windows release ever.
I upgraded to 8.1 but opted to stay with Start8 - seriously, those complaining about Windows 8 should try out an evaluation of Start8 (no I'm not affiliated with Stardock!).