Missing hard drive space after interrupted install

I've been playing PSO2 off an external hard drive, however, now that the tweaker allows for separate installs of NGS I thought it wouldn't hurt to have another copy directly on my computer. However, the install got interrupted on my first attempt, and while the game did install successfully afterward, I was still missing space from my initial attempt (I had over a hundred gigs free before, now only 77)

Not sure if anyone here would be able to help with this but I'd appreciate if anyone else who's had this issue knows how to resolve it

Reminds me of PC launch...

Pretty much the old version is still on there as junk data, some ppl reinstalled so many times they bricked their hard drives. XD