Arduino Uno not getting detected in Windows 7 64bit

[system]

Hi,
I have a laptop running Windows 7 Ultimate 64-OS
I just bought a new Arduino Uno Board.
When i connect the Uno to my laptop via USB the board does not get detected by windows
I have tried connecting to other USB ports but it never gets detected.
I tried connecting the board to a 32-bit windows 7 ultimate where it got detected.

Any help on getting my windows 7 64-bit to detect the arduino board

Thanks

[system]

i think some arduino boards are getting broken from fabric... this is so sad
i bought a arduino BT and it gets recongnized but, it don't print anything to the serial monitor...
i'd became to realize that it could be broken from fabric or someting like that

[system]

windows doesn't find the driver, since the arduino team chose to use another USB -> TTL adapter (another ATmel chip)

number 4 in here:
http://arduino.cc/it/Guide/Windows

[system]

I have same problem here.

I was cheking the Arduino UNO versions on arduino.cc website and I noted that my Arduino is different from all.
You can see the picture attached.

Is it possible that I bought a fake Arduino?