Hi, you shouldn't need any drivers on Windows 10. The boards should just plug in and start working right away (I'll update the troubleshooting guide).
Having said that, I just tried an older Espruino Pico and it does exactly as you say. All looks fine and then both LEDs turn on and windows reports an error. Newer Espruino Picos work fine, as does Espruino WiFi.
Does the Pico work ok for you when it's not in Bootloader mode? It looks like something in Windows 10 has been updated which means it has trouble with the older bootloader, although new firmware works fine.
There are a few solutions I think:
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