Problems with antiviruses can be following:
a) Problem with Windows Defender
Symptoms: Error messages about launching ModelRiskResultsViewer.exe and other modules at different stages of the program operation.
Solution: run run_unlock_windefender.bat script under administrator or manually add ModelRisk folder C:\Program Files\Vose Software\ModelRisk to Defender exceptions.
b) Problem with application antiviruses
Symptoms: similar to the previous item.
Solution: add ModelRisk folder C:\Program Files\Vose Software\ModelRisk to antivirus exclusions