Seal USB dongle not detected by my laptop

Hi there. I need some help. I have a Seal USB TV dongle for watching digital TV on my laptop. I just plug the dongle on a USB slot. Just today, I launch Seal but I'm only having a black screen. I also receive the "hardware not detected" error. What could be the problem? My laptop is on Windows 7. Please help with the Seal USB dongle.
