If you still have your original Office 2007 disc case, the working product key is usually located on a bright orange sticker on the back of the CD case or the manual.
Many sites claiming to offer "activators" or "cracks" are fronts for malware, spyware, or ransomware. How Activation Works for Office 2007 microsoft office 2007 product key 100 working link
However, finding a reliable "100% working" key today is more complicated than it was a decade ago. Here is the reality of using Office 2007 in the current digital landscape. The Challenge of Finding 100% Working Keys If you still have your original Office 2007