Canon LBP7210Cdn Manual page 170

IMPORTANT
Do not uninstall any other device drivers.
If you uninstall them by mistake, Windows may not operate properly.
NOTE
If [USB Printing Support] is not displayed
The USB class driver is not installed properly.
If the USB class driver is under [Other Devices]
The USB class driver is not installed properly. Select [Unknown device], and then uninstall it.
Click [OK].
Click [ ] to close the [Device Manager] dialog box.
Disconnect the USB cable from the computer, and then restart Windows.