Do not attempt to edit the registry unless you are familiar with the regedt32 operation. Making a mistake in regedt32 could result in having to reinstall the operating system.

Run regedt32

Double-click down the path below, except single-click the Global key; this will open the Global key, and you may then double-click PortSearchOrder to view and edit it.  If you do not see these keys, you can close regedt32 and proceed.

1. HKEY_LOCAL_MACHINE
1. \SOFTWARE
1. \Logitech
1. \MouseWare
1. \CurrentVersion
1. \Global
1. PortSearchOrder

If the touchscreen's COM port is listed in PortSearchOrder, you may edit it as follows:

• Double-click the PortSearchOrder string.
• Highlight the touchscreen's COM port text.
• Delete the touchscreen's COM port text from the PortSearchOrder string.
• Close regedt32 and reboot.