Need Help Finding Serial Number

Well, I still don't know why they are telling me to come here. But I need help finding the Serial Number for PhotoShop CS4. I had CS4 for a long time, mostly cause I couldn't afford the newer versions, and I do it for personal use. Now the reason why I need it, sadly I was affected by the power outages that hit the central US and it completely fried my computer. And now I'm trying to re instal CS4 on my new computer. Can anyone help?