USB2 wil not work off a USB1.1 port.
The Port wiring configuration is the same but the electronics behind it is vastly different.
You can use a USB1.1 device in a USB2 port it will just run at the slower speed.
If your machine is designed for USB2 you need to have USB2 drivers installed to make it work at the faster speed. One of the drivers will contain the word ENHANCED.
Beware if buying a USB card /hub, 2 settings High speed and full speed.
High Speed is the 40X faster than USB 1.1 with a transfer rate of 480 Mbps.
Full speed 12 mbps