Can i Reset Windows 10 without flash drive?

[General Hashirama]

I wanted to reset my windows 10 because it is slow due to many temps i can't delete. Is it possible to successfully reset my windows 10 to a new fresh OS (with no files and apps) without using CD or flash drive? and will it ask a license key again?

 

[Colif]

yes/no

Yes to reset, no to needing key

From desktop, go to settings/update & security/recovery/reset this PC
Choose wipe everything and it will reset C drive to how it was just after you installed it