If so, you can retrieve the product key using Belarc Advisor. Go to the following website and download the free Belarc Advisor. Go to the file and double click to run. The program will build a page with all of the information on the computer. Scroll down to the Software Licenses section and you will see the Key for Word or the office suite there.
If this was a version of Word that was pre-installed when you bought the computer, you will need to contact the computer maker to get another product key.