Some users have reported problems with this microphone not working properly with Windows Vista operating system but it is fine with XP and Windows 7. Some MAC & Linux users have also encountered installation problems.
All condenser microphones require a power source to make them work. In the case of USB mics they take their operating power from the computers USB port. If you have a lot of other USB devices connected then there may not be enough power available to run them all at the same time. Disconnect any devices that you do not need.
First step would be to make sure that you connect to a main USB port (not a separate hub). If you are using a desktop or tower computer use the USB ports on the rear of the computer, which are mounted directly on the motherboard. Front panel USB ports are normally on a hub and may therefore prove unreliable with some devices..
Next try to diagnose the problem by process of systematic elimination

1. Test your sound-card - does it work okay with other sound sources such as a microphone plugged into the normal microphone input (red socket) on the sound-card or on your front panel.
2. Do you have another USB sound source that you can plug in to make sure that your computer will accept sound from that route?
3. Now check the microphone for faults. Is the LED on the microphone coming on to indicate it is getting power?
4. If no the microphone itself, or the cable, may be faulty. Try plugging it in to a different computer, games console, stereo or audio device with a USB input to see if it will work there (note not all audio devices will have sufficient power on the USB socket so this test may not be conclusive)
5. Is the computer operating system actually recognising the presence of the microphone in the first place?
6. Does a little balloon pop up to say a device has been plugged in - and does it correctly identify what that device is by telling you it's name?
7. If the system recognises the device but doesn't correctly identify then you may need to install a driver for the microphone.
8. From the windows start menu go to CONTROL PANEL.
9. Click on SYSTEM, then HARDWARE, followed by DEVICE MANAGER
10. Scroll down to SOUND VIDEO & GAME CONTROLLERS. Does the microphone appear here? If yes does it have a little yellow asterisk next to it? If so it is a driver issue.
11. Sometimes a USB driver issue can be resolved by uninstalling the USB controllers and reinstalling them. Scroll down the list of devices in DEVICE MANAGER until you get to UNIVERSAL SERIAL BUS CONTROLLERS. Systematically uninstall every device listed here. To do this RIGHT CLICK on each device and then click UNINSTALL. Then on the TOOL BAR click CHECK FOR SYSTEM CHANGES. this will reinstall all USB devices and controllers.
12. If that does not solve the USB problem go to your computer manufacturers website and download the latest USB drivers for your machine.
13. Assuming you have overcome the USB issue (or if this was not the problem anyway) you now need to check that the microphone is selected as your default audio device.
14. To do this go back to CONTROL PANEL, followed by SOUND & AUDIO DEVICES
15. Click on AUDIO and, under the SOUND RECORDING tab select your microphone from the drop down list.
16. Then click the VOLUME button which will open a window called RECORDING CONTROL
17. Make sure there is a tick (check mark) against microphone and that the slider is up at the top of the scale.
18. If everything is okay up to this point the problem may well lie in the settings for the audio / recording program that you are using. Most programs have some sort of wizard for testing audio settings, which you will need to work through.