(Chosen working assumption for the rest of this report: "ps300b" is a device or service entry containing a key, ID, and password used for exclusive access control.)
The cursor blinked, waiting.
The combination of these two creates an "Exclusive" lock. This means: ps300b key id password exclusive
If you get an error stating an older version is already installed, you must open the Windows Control Panel, uninstall the old PS-300B software, and restart the installer. (Chosen working assumption for the rest of this