I had this problem and found that the driver had to be installed in 'safe' mode. First, remove any drivers which you have installed for the card, remove the card and turn off the computer. Restart...

Hi I have just bought the WDN4800 and had major problems getting it to work with my Win7 64bit machine. Eventually, I found the answer (Kindly provided by Sharon in this forum). Uninstall the drivers...