Slow Internet Speed after Leopard

I'm having a funny problem since the installation of Leopard and that is very slow internet browsing speed. But its not as simple as it sounds. I have another Windows PC on the same network; when its on mac internet speed is slow, when Windows PC is off the Mac internet speed if fast and normal.
I'm not alone in this problem. I read similar problems on Apple Gazette after installing Leopard. Any suggestions?

http://discussions.apple.com/message.jspa?messageID=6039643#6039643
Had to search for it. I'm having the same problem as you see by my post in this forum. I hope this works for me. I also happen to be in South Carolina. Small world.

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