Sorry to hear you’re having problems. On some windows systems it can take a minute for the drivers to load (on most it’s very quick). It seems that if you unplug the Crumble before the windows has finished, it starts the process again.
It’s possible that the Crumble has developed a fault. To move things along quickly I’d like to send you another Crumble to test. Could you send me your details using the form on the Contact page?
All the best,