On the laptop, open IE, click Tools, Internet Options, Connections. To connect to the cable modem, put a check in "Never dial a connection". When you're finished, but the check back. Your desktop will work the same way. If you've never used a dial-up connection on the desktop that area mentioned above will be greyed out.
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I have been having trouble connecting my comcast internet to my girlfriends laptop. I unplugged my ethernet cable from my desktop and put it in the laptop as usual. Nothing worked, even tried using usb connection.
I called comcast and the lady was no help. Sent me through command prompt's ipconfig and ipconfig/renew which didn't work. Suddenly the phone disconnected and the internet connected. I want reconnect it to my desktop but fear that I wont be able to connect the laptop again.
Is there any way I can fix this if this occurs again and can I get the usb connection working?

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