lost all my data on hard drive due to failed insalation of gta 5

I got my grandson gta 5 for his Xmas this year and when i installed the first disc it reached the end after an hour and didn't Finnish it reached the full mb but didn't complete just stayed at 76##mb with the stupid loading symbol but not actually installing, that in itself was not the problem after two hours i decided to start again so reset console and i tried to sign in but my grandsons profile was gone and so was every other profile after i downloaded his profile i realised every thing on the hard drive was gone all his friends profiles who were not connected to live are lost and all his game progress on all games is gone and all his dlcs are gone how can this happen just by installing a game my grandson is really upset about everything being lost because he has lost the dlc discs for the games so can't reinstall what can i do to sort this out please i really need a solution
 

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Last updated July 4, 2018 Views 4 Applies to:

Does the Xbox recognize the hard drive on the console?

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Yes there seems nothing wrong that i can see and the console is only three years old

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