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Apparently this is a fairly common problem with XP, as there is a lot of discussion about this across the Internet. I haven't found the right fix yet, and am trying to avoid reformatting, which I can do as a last resort.
I have two XP laptops at home that were both working fine for weeks with a new Cisco wireless router, then suddenly they both say "Limited or No Connectivity." Both of these laptops work fine with another wireless router. Also, a third laptop in the house (Vista OS) works fine with the same router that won't work with the two XP laptops.
I'd suggest doing this first:
1. Go to Start - Control Panel - Network Connections
2. Right click on the Wireless connection and do properties.
3. Click on the Preferred Networks tab and remove your network from the list.
4. Try to reconnect to the network.
Obmute, thanks for your suggestion. I have tried this many times. It is apparently a deeper problem than this. When I try to reconnect, it grinds away for 10-15 minutes, saying, "Validating Identity" then I get the "Limited or No Connectivity" message.
Does anyone know if this could be a malware issue? This unit was recently reformatted, but I haven't run malwarebytes or adaware or anything to see if that would clear it up.