laptop working slow

[WinXPto10]

recently this Monday i was letting my friend borrow my laptop and my friend gave my laptop back yesterday, now it's very slow, after scanned with Avast, Malwarebytes, Adwcleaner, Junkware, Hitmanpro, etc., no threats found! i was decided to ran sfc /scannow in elevated command prompt, it gives me error
I am getting so frustrated

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[Compton]

How to Test Your Hard Drive Using SeaTools for Windows

how to check your hard drive health status with crystal disk info

[WinXPto10]

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[Partha]

First, run chkdsk /r and then as Compton advised, check the disk's health with those tools

[Compton]

what is CPU & memory usage?

[Partha]

I would advise a clean reinstall of the OS... Nothing else in my view that can resolve this

[Double clutch]

Please run this Dism /Online /Cleanup-Image /RestoreHealth  command in an elevated command prompt And then rerun the SFC scan. If still no joy Download Windows All in One Repair Tool (free)   here
https://goo.gl/6ce93
 Follow all steps to the letter and make sure that you create a new restore point, and Backup the registry. Like the program suggests perform a proper Windows clean boot before running the repair, details for the clean boot herehttps://goo.gl/VkkbUL.

[WinXPto10]

i don't trust my friend anymore borrow my laptop

i have lots of videos on my laptop, what is the best option to backup my videos? i don't have extra flash drive

also i can restore my system by AOMEI Onekey Recovery

[Compton]

you can back videos up using dropbox

[WinXPto10]

thank you Compton but i have 120 GB videos and dropbox is only 2 GB free edition