There is no possible way anyone could provide an answer based upon the info you have provided. Go to device manager and look for any unknown devices or know devices that have an exclamation mark requiring a driver. If the the device is listed as unknown, go into the properties for the device, go to the details tab and choose Hardware ID from the Property drop down box. Copy that string and search google with it to see what the device is, then go to the MANUFACTURERS website and grab the required driver.