Hi there, I had a previous version of Office 2013 installed and I followed the instructions of using the Microsoft removal tool (the troubleshooter can not find any issues). I used the Office Toolkit to remove all different versions of Office. I also used CCleaner. I have different 2013 versions of office that I have tried installing but they all give me the same error message: "Error 25004: The product key you entered cannot be used on this machine. This is most likely due to previous Office 2013 trials being installed: System error) Can you tell me how I can go about completely removing Office 2013 (the microsoft office removal tool is not working optimally). What else can I do to install? Office Toolkit 2.5.2 says "installation is not supported". I have tried for over 8 hours. Thank you.