Finding A window 7 Oem

Joshua92

Honorable
Dec 6, 2015
18
0
10,510
I am helping a family friend with their pc they dont have a disk and the partition could be infected I want to get them a disk but I looked on amazon had pirated and the reviews were terrifying, newegg was okay,microsoft does not sell it and walmart was just a thought.

my question is where is a good site if any and what am I looking for to know its a good buy.