Belkin N Wireless USB (F5D8053v4) speed only at 150Mbps?!

Hi all,

1st of all let me say what a great comunity out here!

please help me out! please!
Just bought one Wireless router belkin N1 Vision with a USB adapter belkin N Wireless USB.
I can only get 150Mbps max! No other networks are in range!
Router is configured for WPA2, Bandwidth is 20Mhz+40Mhz Auto. If i select only 20Mhz it drops to 72Mbpz max, soo it's working at 40Mhz when I select the Auto option.

Is this USB adapter limitation? Please confirm! If it is i still can trade in the store for another one. Thinking on the belkin N+ Wireless USB.

Please advice!
Thanks

I'm not ignoring you, just have no good answer.
What is it you're doing that requires 150mb throughput?
If your internet connection is that fast, I'd like to have it also!