Downloading Microsoft Word 2007 on Window 8

Hi,

I just bought a Samsung - ATIV Book 9 laptop running on windows 8. I have a license for microsoft office 2007. When I run the exe file, it was able to extract but when it asks to put the product key, there was no space for it to put it. It is this little box that said you can put in the product key now but it didn't have a space for me to enter the code or next button. Do I need a different exe file for windows 8. I didn't have this problem with my old computer (window 7).

Thank you so much!