Receiving Network Timeout message even while "connected" to internet

I have a Gateway laptop with Windows XP.  After starting my computer, the internet connection works for about 5 minutes, then gives me a Network Timeout message.  The connection is still "excellent", and I have tried my computer on several different wireless connections and still have the same problem.  If I restart the computer, it works again for a few minutes.

I have run a virus scan with clean results.  I haven't recently installed any new programs.  I have tried connecting with the firewall turned off.  I am wondering if it is related to my wireless card (Linksys).  I have tried installing new drivers and nothing has changed.  What could be causing this issue?
noiseconspiracyAsked:
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MrJemsonCommented:
Disable the wireless and plug into the LAN.
If you do not experience issues, we can begin diagnosing the wireless connection.

On a side note, if you do not have any issue plugged into the LAN, ensure you have the latest firmare on your wireless router, and your wireless card on the laptop.
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noiseconspiracyAuthor Commented:
Okay, I tried plugging directly into the LAN, and my computer had limited or no connectivity.
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MrJemsonCommented:
Sounds like the router might be your issue then. Have you tried a firmware upgrade yet? If you havnt that would be my first suggestion.
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noiseconspiracyAuthor Commented:
I have tried using a wireless connection on three separate networks/routers and it has not worked, so it seems to me that the problem is with the computer itself.
However, I just tried connecting a different laptop to the LAN and it didn't work either, so I will try a firmware upgrade.
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noiseconspiracyAuthor Commented:
I've used the LAN connection directly from the modem and still cannot get any connectivity. However, the LAN worked when plugged directly into a desktop, which leads me to believe that the modem and router are not the problem. I cannot get any connection from wireless or from the cable plugged directly into my computer. After further exploration, I found that both times my laptop has sent packets but not recieved them. It seems to me that this is an internal computer problem and not the wireless card or router. Any thoughts?
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MrJemsonCommented:
Rebuild your TCP/IP stack?

Also I would suggest installing Wireshark and running a trace on the WIRED network and post the results of the packet capture here.
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noiseconspiracyAuthor Commented:
Could you explain how to rebuild the TCP/IP stack, or point me to a website that can? I don't really know much about this.
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noiseconspiracyAuthor Commented:
Actually, I've just fixed the problem by deleting ZoneAlarm from my computer. Thank you so much for all of your help.
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MrJemsonCommented:
Glad to see you got it sorted!
I would have suggested this, but your original post said there were no new programs and firewall was disabled.
ZoneAlarm is renowned for this type of issue.
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