ok, so if the driver installed. have a look presuming its a laptop for a switch on the laptop. Or go into control panel in windows, and click on the sytem and security Icon. where it says sytem, look for device manager and click on that. You want to see if the hardware has indeed been picked up by the laptop. If it is listed then right click on the device and see if it is enabled.
As a small note some laptops allow you to enable the bluetooth device by holding the Fn key and hitting the Fn symbols on the numberd keys at the top of the keyboard ok.