The installation file size is 2.6 (32 bit) to 3.2 gbs (64 bit) disk space used by windows 7 is approximately 8 to 10 gbs. system requirements:. Windows 7 64 bit requires a minimum of 20 gig and 32 bit windows 7 requires 16 gig. if you get a 30 gig ssd you will be ever lastingly juggling your files to free up space.. A bare windows 7 install, updated, will take about 20 gb. you should of course leave some free space and you need space for any applications or data that might end up on the windows partition. most people would suggest you allow at least 60 gb for c..
