about the recovry of original os .fail to take recovery of original os

[Prashik_1]

sir I have sony SVF15218SNB LAPTOP.i had install the third party windows 10 and fail to take the recovery of the my original os .As install os not working properly I want original os ,i.e qindows 8 single language .Can u tell me how can it get it back and intall it. sir also in c drive I have folder namely "windows old ".
please help me to solve this problem

 

[Saga Lout]

Look in Control Panel for Recovery and see if that offers to take you back to the previous Windows system.