XP machine drops off network twice every day?

Greetings,

I have a SBS2003 and several PCs in the office all running XP Pro. I have one PC that drops off the network every morning, and every afternoon. Almost like clockwork. It cannot reach the internet, or any shared drives on the network. A simple reboot fixes the problem, but the user is getting tired (I don't blame him) of rebooting twice a day. Any suggestions? Cheers!
bbiitAsked:
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bbiitConnect With a Mentor Author Commented:
We are replacing the machine. It's rather old and the user needs an upgrade.
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vnicolaeCommented:
Try updating the NICs drivers to the latest ones. Check also the event log. Do you see anything like "cable unplug" in the logs? Can you connect the PC in another port on the network switch?

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Darius GhassemCommented:
Like it has been suggested update NIC drivers and firmware.

Remove computer from domain reset the computer account in AD then re-join system to the domain could be your secure channel password is not correct
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Delphineous SilverwingGood Ol' GeekCommented:
Are these machines on DHCP or a wireless network?  
If DHCP - When the machine loses its connection, check the IP address information obtained from DHCP.
If DHCP - Check for rogue machines/routers giving out DHCP addresses; this applies to computers that have turned on Internet Connection sharing.
If wireless - check for another wireless network with the same name - common example is the default LINKSYS

Have you updated the network drivers to the latest from the computer or network adapter manufacturer?

Replace the Network Cable.

Replace the NIC.
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innovatorengineerCommented:
Another possibility with it being like "Clockwork" is the power settings on the NIC, are they allowing the network card to be powered down after a period of time, and does the user have a routine that is followed everyday that allows the time out to happen everyday( coffee, or a meeting every afternoon at the same time?)

The power settings for the NIC can be in both the NIC properties and possibly the bios if it is an on board card.  
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jonyeltonCommented:
Next time you get kicked off the network, open a command prompt and type in gpupdate /force.  If that fixes you, then it's like you are not recieving the group policy update.

Anything in the event log viewer when it happens?
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bbiitAuthor Commented:
None of these solutions worked and I can't post again until I "resolve" this question.
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