|Even assuming you need a disk cleanup that figure seems kinda high. Are you sure the 740 gig is used space and not free space? The way windows counts bytes a 1 TB drive will show about 931 gig after formatting. Using less than 200 gig of that would show free space of at least 731 gig.|
Or does the drive have multiple partitions with virtual drives on it? If the 1 TB is divided among more than one partition then each is starting off with less available space.
Real men don't use AntiVirus; they just reformat