Corel Font Manager X8 closes forcedly after splash screen. In Task Manager, I see the process "FontManager.exe", a few seconds after, it disappears! What is happenning?
Try holding the F8 key when you launch the font manager and rebuild your database.
Corrupted fonts I can't help with but in CorelDRAW under the font drop down you can set the application to only see system fonts and fonts installed in Windows.