Hi, and welcome to TSG.
The product key should be on the holographic Windows 7 Certificate Of Authenticity sticker attached to the outside of the computer. On laptops, this sticker may sometimes be inside the battery compartment. I have attached a photo of such a sticker used by Dell with part of the product key blanked out.
The product key should be on the holographic Windows 7 Certificate Of Authenticity sticker attached to the outside of the computer. On laptops, this sticker may sometimes be inside the battery compartment. I have attached a photo of such a sticker used by Dell with part of the product key blanked out.