I have also tried to remove the upper and lower filters in the registry following instructions from
http://support.microsoft.com/kb/929461
I have discovered that there are no upper or lower filters in the specified section of the registry
The message displayed in device manager is
" The drivers for this device are not installed. (Code 28)
There is no driver selected for the device information set or element.
To reinstall the drivers for this device, click Reinstall Driver."