Blue th and my acer laptop?

Ok i have an acer aspire 5050 laptop it has bluetooth already downloaded onto computer but when i try to get it to become discoverable it keeps popping up an error message and says unable to make discoverable and can not save the settings? can somebody plz help!
Answer
You can have blue th downloaded on it but more than likely it don`t have the blue th device installed in the laptop. i did the same than and figure out i had to buy the usb blue th device.