If you are using a VID and PID which is different from the default FTDI ones (VID = 0x0403 and PID = 0x6001), you must edit the uninstaller FTDIUN2K.INI files using a text editor such as NotePad. In the [Uninstall] section of each file, edit the line
to reflect the actual VID and PID used.
The following example shows a new device with a VID of 0x1234 and a PID of 0x5678. In this example, the altered line is shown in red to highlight it.