"NoBackendError: No selected backends are available! Did you install the comm modules?" Error doesn't allow me to connect via USB

[Harib]

Hi, 
I have started using NXT-Python recently so I'm quite new to the interface. Getting to the point, python doesn't connect with my NXT brick at all. It installed "install.bat" as the tutorial (https://code.google.com/p/nxt-python/wiki/Tutorial) said. The problem arrives when the I try the next step ie., running an example program. The brick doesn't show any response but the output screen shows this error:

>>> 

USB module unavailable, not searching there

Bluetooth module unavailable, not searching there

Traceback (most recent call last):

  File "E:\NXT Python\nxt-python-2.2.2\examples\spin.py", line 12, in <module>

    b = nxt.locator.find_one_brick()

  File "E:\Python\lib\site-packages\nxt\locator.py", line 112, in find_one_brick

    for s in find_bricks(host, name, silent, method):

  File "E:\Python\lib\site-packages\nxt\locator.py", line 80, in find_bricks

    raise NoBackendError("No selected backends are available! Did you install the comm modules?")

NoBackendError: No selected backends are available! Did you install the comm modules?

>>> 

Awaiting your reply,

-Harib

[Harib]

I have also tried using bluetooth but I have no idea how to start.. can you please post a step by step method for using bluetooth with NXT?