If the computer detects it, it's probably working. Open up your system's volume control panel, go to options, click every checkbox under "show the following" and make sure any input jacks (called AUX In or Microphone) are not muted and are set to maximum volume. If you're using a program with your mic, go to its options menu and make sure "microphones" or "recording devices" aren't muted and are at maximum volume. It would also be helpful to post some other info (like does your mic work on someone else's computer, your operating system, etc.)