D-link wireless N router.

Ok, heres the problem.

I have a D-link wireless N router, my PC is connected to it directly. I also have another PC in the living room connected to it with a USB wireless adapter.

When the wireless PC is connected to it, every 30-45 seconds or so I get an internet freeze spike, as in my internet stops responding ( no error message or anything ), when the wireless PC is turned off, everything is fine.

The wireless PC is not downloading anything, no viruses or spyware on neither.

Both are running windows XP home.

ANyone know why this could be happening ?

Edit;

my network card:
NVIDIA nForce Networking Controller

 

are you using wzc or the usb adapter utility for wireless?

have you setup the wireless onnection, are you using encryption?

 

No we're not using encryption but I'm using Network Magic to monitor any outside connections, nothing.
And Yes, I am using the USB adapter utility for wireless.

 

i don't knowwhat network magic is but i just use the adapter utility.