Close the PowerQuizPoint interface dialog on clicking the Cancel button or the window close button (X) on the top right corner of the interface dialog. Close PowerPoint. Reopen your presentation and try converting again. If the conversion process still hangs, close the PowerQuizPoint interface dialog by hitting the Cancel button and close PowerPoint. Go to the PowerFalshPoint installation folder [eg: D:\Program Files\DigitalOfficePro\PowerQuizPoint] and delete folders Output and Temp. Now try converting again.