Have you read all the instructions for the microphone, the sound card in your lap top and the interface software? There may be a sensitivity mismatch between the microphone and the computer input/sound card. This can result in a higher noise floor. The microphone may have a switch on it (I didn't read about it) and your sound card may have user adjustable parameters in it's own or the interface software? You want the microphone output to be as close as possible to the maximum allowable input for the sound card short of clipping. Information on how to achieve this should be available in literature specific to your devices. Interpreting the information, relating the devices to each other and learning a solution can seem daunting, but the answer is there. You might be able to shorten the process by focusing on terms like "sensitivity", "noise floor" and "unity".