Particle Illusion Standalone Not Starting

User is running Particle Illusion standalone version on Windows 10 21H2. When clicking on the icon, the app does not start. It does not show in the task manager but is listed in command prompt tasklist. You cannot kill the process as it is shows access denied even if running cmd prompt as admin. You have to reboot to get it to close the processes. You can start multiple processes but the app never starts.

Have uninstalled/reinstalled & deleted reg keys.

If deleting registry keys (Preferences) does not help, then I suggest updating graphics card drivers.