Roland GR-640 User Manual page 130

prompting you to do so is displayed. Click Yes.
After the computer has restarted, open Control
Panel and click View devices and printers.
If you can see the icon of the machine to delete,
right-click it, and then click Remove device.
* Download the driver for the machine you want to delete from the Roland DG
Corp. website (http://www.rolanddg.com/), and then select a folder to extract
the files into.
Installation Procedure