01-28-2013 02:06 PM
Since the computer works well on your girlfriend's N router, the issue may lie in the technology of the router itself. The router you are using runs on a single band frequency of 2.4 GHz, which used to be very common. So common, in fact, that there are many things that can cause interference. Newer routers, such as a/b/g/n devices, use dual band frequencies of 2.4 GHz and 5.0 GHz. The experience you've had with the N router makes me think that, to obtain maximum and peak performance from your wireless experience, a dual band router with a/b/g/n capabilites may be necessary.
Hope it helps,