I up graded to Windows seven and I did a system check and all are just about maxed out when I had vista ultimate 64Bit the hard drive was maxed out with seven its at 2.5 the rest are maxed or close to maxed out I don't get such a large difference between the two and its dose slow when I do hard drive intensive apps like copying files video encoding I don't get it I have 8 gig ddr3 1600 I didn't have this problem with vista.