Why does the Windows 10 OS 64-bit System Files take up like 154 GB of my SSD?

[Ayan Zeeshan Ahmed Hussain Bilwani]

I've searched everywhere and it said the Windows 10 OS 64-bit System Files require only 20-25 GB. I have a 250 GB SSD which got completely corrupted by a virus so I completely formatted it and reinstalled the Windows 10 OS in it, but it shows that 154 GB space is occupied by the system and reserved files. I don't know how to remove excess reserved files or remove the unnecessary system files (if there are). Please help me solve this, without the need of reinstalling Windows again, I really am not in the mood to do it again.

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