This is usually an installation issue:
1. Reset User Profile How to reset a users profile
If the issue persists:
2. a). Clean out %tmp%\Insol2datacache
Open a Microsoft file explorer window and type “%tmp%” in the address bar.
Look for sub folder Insol2datacache and delete it.
b).Remove the software registry entries (Computer\HKEY_CURRENT_USER\Software\Exalt Technologies)
Note this is an admin function be sure to backup your registry before making any changes.
If the above two options do not solve the issue
3. Uninstall and reinstall the software (workstation) on the users computer