A professional diagramming tool that helps users visualize complex information through easy-to-understand diagrams.
Hello Joe I,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well?
Do you have product key?
I recommend you repair visio; go to > Control Panel > Programs and Features > Microsoft Visio Professional 2013 > Repair.
If you are still unable to activate, I recommend you contact Microsoft business support via telephone. Click link below and select your region to find contact number:
https://support.microsoft.com/help/c0389ade-5640-e588-8b0e-28de8afeb3f2
Please let me know if you need more assistance.
Give back to the Community, Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below.
Warm Regards