I dunno the frequency of defrag. u r doing. I prefer it once in 20 days.
In C-drive, dont allocate that much space (20 GB). If u make it of 5 Gb, u can defrag it more easily. And in that drive, keep only OS. Dont clutter it with other non-windows-related materials.......
And lastly, did u clean ur system after buying it to remove those junk softwares that generally a laptop comes with?
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