Cannot ping external websites

I'm working on a clients WinXP Sp3 computer.  The wirelesss adapter has been having difficulty connecting to wireless signals - it would say it was connected, but wouldn't get an IP address.  I have reset, re-installed, delete profiles etc multiple times with no luck.  Tried connecting to other wireless networks too that system hadn't previously connected too.  

I did a netshell int ip reset command and after restart the wireless connects fine, gets ip address from gateway, but cannot access the internet.  I can ping local machines and the gateway, but no external sites by name or ip address.  Get error "Destination host unreachable".  The firewall will also not enable - I get error "Firewall cannot be started due to ICS service", so I've tried the sharedaccess.reg repair.  

Gotta run, so can't give more details yet.

Thanks,

Ryan
rjessopAsked:
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giltjrCommented:
As a start we need the output from ipconfig /all.
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rjessopAuthor Commented:
ok, i'm back at it.  So I've followed http://support.microsoft.com/kb/299357 without success.

There is nothing special about the network setup - DHCP.  Have system at my place now, same trouble of not being able to load websites or ping addresses/IP outside gateway.

There is no 3rd party firewall.  

I'm feeling like wiping the system and installing fresh.  Even when I did get the wireless working for client about 2 weeks ago, the windows wireless icon in the tray would always appear as though the system was still acquiring an IP address (Gold ball going back and forth under wireless connection icon), but system would work, and of course ipconfig showed valid configuration.  Then client had power outages and now I can't get it to successfully reconnect.

When I posted first message, system was successfully getting IP Address from my router/gateway, but was not communicating outside of local network.  Since I've returned, it is NOT getting IP address.  The NetGear WG311v3 Smart Wizard indicates it's connected to my network and even pops up an "internet connected" message, but it definitely is not.

I've tried allowing Windows to manage wireless networks, but when I start the wireless zero configuration service it only starts for a few seconds, and I can't actually configure the TCP/IP setting manually either as clicking the protocol doesn't open dialog window to do so.
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Stephen McTigueAssistant Director of Information TechnologyCommented:
Are the other local computers able to connect to external sites? Are the other local computers connecting by wireless as well?
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rjessopAuthor Commented:
yes, other systems work fine.  It is not a network or wireless access point issue.  It is most definitely the system.  Is there anyway to reset all system settings without actually doing a factory restore? (i.e. network, firewall, security, etc)?  System restore is turned off, so that's not an option.  not sure if it will actually turn back on either.  Something is pretty messed up with the system, yet I don't think it's malware/virus related.
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Sudeep SharmaTechnical DesignerCommented:
Did you tried SFC /scannow yet?

Make sure you have your Windows XP CD with you before you run that command.
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rjessopAuthor Commented:
Problem resolved.  I did run sfc /scannow, but I also took out the Harddrive, put it in another machine and found a virus.  Both machines where using MS Security Essentials, so i don't know why the machine didn't catch & clean the virus on its own
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