Consider the following the scenario:
On a system running Windows 7
Open up Devices and Printers
Click "Add a printer" and select "Add a network, wireless or Bluetooth printer"
Select a WSD (Web Services on Devices) printer from the list of printers
Click "Next" to start the installation
While the printer is installing, click "Next" again
This may cause an error to appear, "Operation could not be completed (Error 0x00000643).
On a system running Windows 7
Open up Devices and Printers
Click "Add a printer" and select "Add a network, wireless or Bluetooth printer"
Select a WSD (Web Services on Devices) printer from the list of printers
Click "Next" to start the installation
While the printer is installing, click "Next" again
This may cause an error to appear, "Operation could not be completed (Error 0x00000643).