please help! i am handicapped and cant get my flash player to work

i

am not good with techinal situations on a computer i had adobe

flash player installed on my computer and i was removing programs off of my sons computer to speed it up and i accidentilly removed the adobe flash player, and now my son cant watch any youtube videos or ANY other type of videos or movies on his computer, when he trys to watch a video on youtube it says "you need to upgrade or download (dont remember witch one) so everytime i try to download the adobe flash player it fails it fails, ive spent hours and hours trying to fix this problem, cold someone please help me and my son out, yor time and input are greatly apprecated! thanks