Hi,
Try updating the ‘Network adapter’ drivers and the phone drivers. Code 28 error indicates the driver the device is missing.
Explanation of error codes generated by Device Manager.
http://support.microsoft.com/kb/310123 (Applies to Windows Vista and 7).
Wired and wireless network connection problems in Windows. Make sure to update driver for hardware that isn't working properly. Also, check optional updates under ‘Windows Update’ for drivers. You may also download the latest drivers from the manufacturer’s website.