Do you plug your ti84 calculator before installing ticonnect?
If yes, Windows installed his own driver and you need to remove this driver before.
Then remove ticonnect and reinstall it.
Are you sure that your calculator is ON when you try to do that?
If you have trouble at this point try to plug/unplug the ti 84 plus, and restart ti device explorer.
Also try to change your usb port (if you have the link with usual usb).
When ticonnect will recognize it, notefolio creator should do the same.