You hv Paid Rs 4000 as license fee for genuine windows 10. Why do you want to waste that money and install an counterfeit/pirated OS on your new PC which will become outdated within 2 years from now ? If you don't like windows 10 because of it's UI or privacy isssue then you should have bought Dos machine and save that Rs 4000
I hope you have not bought an under power processor for your heavy duty tasks and has enough RAM to play with and if still your PC is running slow then Just upgrade Hard drive to Samsung SSD