Hi
I am amazed that Asus would supply a modern laptop with dos rather than Windows 8 or 8.1 (or 7 pro)
Have you looked on ASUS web site for Win 7 drivers?
since there are none there you will have a lot of hard work finding the correct drivers.
Dont start installing W 7 until you have found the correct drivers and researched the possible problems.
An alternative is to try some alternative shells to replace the start button and make things look more like W 7
Get classic shell here
http
/www.classicshell.net/
free
----------------------------------------
also start8
from http
/www.stardock.com/products/start8/
costs US $ 4.99
there is a 30 day trial version
(It seems there are drivers for similar models which may work)
backup all the important data before starting the process because you may have to format the hard drive
regards
Mike Barnes