Roland GR-540 User Manual page 371

Click Start to display the Start menu.
Open File Explorer, and then open the drive and folder containing the
driver.*
Double-click SETUP64.EXE (64-bit version) or SETUP.EXE (32-bit version).
If a User Account Control window appears, click Yes.
The setup program for the driver starts.
Click Uninstall. Select the machine you want to delete, and then click
Start.
If a window prompting you to restart the computer appears, click Yes.
The uninstall procedure is complete when the computer finishes restarting.
* 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.