Reinstallation trouble of 2007 Microsoft office system
I had to reformat my laptop because of a malware attack. During the reinstallation process, I had trouble reinstalling programs. I was trying to activate my 2007 Microsoft office system using the backup copy, but when I had entered the product key, the prompt said "Invalid product". What could be the problem with my 2007 Microsoft office system and what can I do about it?








