How to restore system image on my second partition

[dayzzy]

I currently have win 10 on my main pc bt I discovered my gaming is too slow, so I want to install win 7 through a system image I created on my second pc( the same type and specs but different username and o.s since I upgraded my main pc from win7 to win10) onto the new partition I created on the pc ( for the win7 installation). The external hd I used to create the image was western digital hd bt its not showing in the 'select usb drive' when trying to restore the image.

Edit:: I actually want to dual boot win10 and win7

 

[dayzzy]

how can I dual boot win 10 with win 7 using win7 system image

I upgraded to win 10 on my pc
bt I discovered my gaming is too slow,
so I want to install win 7 through a
system image I created on my second
pc( the same type and specs but
different username and o.s since I
upgraded my main pc from win7 to
win10) onto the new partition I
created on the pc ( for the win7
installation). The external hd I used
to create the image was western
digital hd bt its not showing in the
'select usb drive' when trying to
restore the image. I used windows backup for the image; I didn't use third party app.

Edit:: I actually want to dual boot
win10 and win7