Hello experts. So heres the thing i have a Dell laptop with win 10. When i switch on my laptop it shows the dell logo with bios setup F12 n all. Then comes the windows logo n thats where the problem occurs. The loading circle cirulates for couple of minutes n then comes at the bottle the windows will reastart for a blink of a second and it resarts. It goes on and on and on.

So i tried to reinstall the windows to Win 7 professional. But then too the same thing. Dosent allow me the options to do so. I tried to open in safe mode it dosent work the ame damn issue. I hope i get a solution.
The best solution will be help me downgrade the windows.