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WiFi help

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We have an xfinity (Arris TC 862) combination modem and wireless router from Comcast. We have two laptops and an Xbox all wirelessly working without a single problem. However my desktop pc which is connected to the modem/router by means of an Ethernet cable keeps losing the network connection. The connection blinks on and off and I get a message saying that we have no internet service, and then it comes back on. This happens all day on all three internet browsers (Internet Explorer, Firefox and Google chrome). Can I just use Wi-Fi on my desktop to eliminate the problem?
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First, try uninstalling your Ethernet connection from Device Manager. Reboot, let XP rediscover it and reinstall the drivers. See if that helps. If not, see if there is a newer driver for the Ethernet connection.

What is the make and model number (complete) of your computer?

Otherwise, a better choice would be to install a new PCI Ethernet card and not use the built-in (on-board) Ethernet connection. They are quite cheap.

cheap pci gigabit ethernet card
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Check also for a loose ethernet cable or a bad cable.
Suspect (as stated) a possible bad ethernet card.
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