restore win 7 after win 10

Hi!

I own a dell inspiron n5050 (win 7) and a few monthw ago i decided to try the new windows 10. However i faced a few problems recently, audio drivers could not be installed, my screen worked only through HDMI to my tv, and i decided to restore to the factory settings and win7. However, when i pressed F8 in boot, no screen apeared. Is it possible to restore? Or do i need to install fresh win7? And where can i find win 7 home premium 64bit? 

If i'm not mistaken there is a hidden partition that contains the files for the recovery. Can i access that and make the recovery?

Thanx in advance!