Can I get a replacement on my laptop I purchased at BestBuy?

I sprayed Windex on my laptop's screen (stupid) and it totally mest up the way my computer projects and i'm sure I need to take it to Best Buy. I have warranty, but I don't have my receipt for the laptop but, I have the box I bought it in. Will they still accept it, also, will they replace my labtop or just fix it for me? Thanks.