After installation you get this message about - Font "Arial" does not support style "Regular".
![undefined](https://cdn.livechat-static.com/api/file/kb/file/10075403/bb2cc63050-f9daf7ddc9d1ff10ede8.png)
This message tells you that you are missing that Font style. It's likely that it is corrupt or a windows update somehow removed it. That can happen when uninnstalling software
Solution
To fix this issue, please go to "Start", rightclick and choose "Run"
![undefined](https://cdn.livechat-static.com/api/file/kb/file/10075403/320ca4889f-11cf562210b44d28cf06.png)
Then type c:\windows\fonts\arial.ttf
![undefined](https://cdn.livechat-static.com/api/file/kb/file/10075403/3ce23afc44-f432e142f00280fdab84.png)
This dialog will appear and you click "Install"
![undefined](https://cdn.livechat-static.com/api/file/kb/file/10075403/3d108767c8-a50ba984752d50573a3c.png)
When the installation is finsihed, please start your Revit with Naviate and the error message is now gone.