I suggest you try a complete Simlink install :
- 
Please use specifically Windows Programs and Features to uninstall Simlink: 
- 
If they exist delete directories 
 c:\Users\username\AppData\Roaming\Navigraph\Simlink and
 c:\Program Files\Navigraph\Simlink.
- 
Then download and install latest Simlink . 
- 
Restart computer 
Cheers
Ian
