How to restore the lost free space on my hard drive ? :(

Hey all ...
One week ago, I tried to Install a game ... but while it was installing ... I Forced quit the installing because my macbook froze . I realized that the free space available on my hard drive is less than what it was before ... about 17 GB were gone
I used the " Clean My Mac " app to remove not used and unwanted files but my hard drive free space still the same
So right now i need the best solution from you guys ... and Im thinking to format my macbook but I dont how :P

Welcome to Apple Discussions
Don't rush to reformat and reinstall just yet, grab a copy of Disc Inventory X and see if you can see the unwanted file(s) that's taking the space with that ?

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    Most commonly used backup methods:
    https://discussions.apple.com/docs/DOC-3045
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