De [aqui] [1] (link removido devido a um site com spam):
After removing the printer from Devices and Printers there are still traces of the driver to re-install itself when plugging in the device. Under Control Panel and Administrative tools theres a new option here in windows 7 labled Print Management. From here you can see all the printers you have ever installed and all the drivers that are still amongst the system. under the option All Drivers on the left is where I found the print driver I new was hanging around somewhere but couldnt find to remove, Right clicking on the printer name and choosing Remove Printer Package allowed for windows 7 to scan for and find the drivers and allows you to delete them."
Além disso, a impressora está instalada em outra conta e configurada como a impressora padrão? Talvez a conta do administrador possa fazer com que reapareça na sua conta.