Please make sure that your system is fully updated. If in doubt run Windows Update and install all system updates. Also, use the link below and ensure you have the latest graphics drivers. Outdated drivers can cause these problems so it is wise to ensure you have your drivers updated.
https://www.geforce.com/driversOne other thing to consider is updating your OS to Windows 10. All our software runs best under Windows 10. As support for Windows 7 will eventually stop now is a great time to upgrade.
Peter
Forum Administrator
www.reallusion.com