You did not indicate whether you actually had issues with the PC (not just the indications in Device Manager) and the circumstances leading up to them. What OS? What PC? What devices are affected?
1. Try uninstalling and reboot to allow Windows to reinstall the driver.
2. Doesn't seem to be an issue if the hardware is working. See this MS response
3. Seems to be related to IP6 which is not extensively used at present so it may not affect Internet very much. See this
long series of steps to take.