Font menu problems in CDX7/Windows 10

Working in CorelDrawX7 and Windows 10, and my font menu is not working properly. When I move the mouse to the top of the font menu bar, it opens a blank of the font pull down selection menu and my computer freezes for several minutes. Then the fonts appear in the selection menu and I am able to maneuver through the fonts for a few moments...but then it freezes again. Any suggestions? Thanks for your help.