No Internet in windows xp

Hi,

We've got a pc with no internet connection. It suddenly stopped working.
This is what we've done so far.
Done spyware malware and virus scan all clean.
Reset TCP/IP stack.
Reset internet explorer.
Did system restore
Tried satic ip
Reset winsock

We can ping any sites on the net but can't browse from either IE or Firefox.
Other LAN users unable to browse shared folder on this pc.
We took it offsite problem was apperent did system restore and all was good on our network but when returned pc to client all was gone to hell again. Same network cable works with other pc too.
Could it be the router blocking this MAC address??

Any ideas?

Thanks
CompTroubAsked:
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CompTroubAuthor Commented:
Thanks everyone for your input it seems to be resolved at least for now.

As suspected it seems the router was having a spasm attack and was disliking that particular NIC. Renewed the lease, PC got a new IP address, firewall now asked for network type and there was light.

Cheers
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hmarcbowerCommented:
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CompTroubAuthor Commented:
thanks heaps but as I mentioned the pc does not appear to be infected.
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hmarcbowerCommented:
Understood, but it does point out some registry entries that you could check.  It sounds like there is a proxy server set somewhere, and the registry entries mentioned in that posting may be of interest.
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Gump_000Commented:
It could possibly be a faulty NIC. You could try replacing the NIC (USB or PCI) to test.
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CompTroubAuthor Commented:
well if it was faulty NIC it wouldn't work on our network I guess??

also hmarcbower same for your reply if there was a proxy set in the registry it wouldn't work on any network or would it?

Cheers
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hmarcbowerCommented:
It would still work on the local network, because it's not trying to leave the network.  It's in the Internet Settings area, so my expectation would be that the proxy would only be used in the event of heading off your local network to the internet.  Worth at least looking at... even if it's a quick "nope, no problem there." :)
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Guillermo FeijóoSystems administratorCommented:
Besides proxy issues, wich I think might be the problem as other experts said, you can try reinstalling the NIC driver.
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bright12Commented:
Did you try to create another user on that PC? It can be that the user is corrupted.
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CompTroubAuthor Commented:
Thanks guys but I have to say again it works on other networks just fine so it must be an isolated issue on this particular network.. All users and a new one we tested experinceing the same issue.

Cheers
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bright12Commented:
So you are saying that when other users and or system are connected to this network they also have problems to connect to the internet? And it is not the system that caused this problem?

This to make it somewhat clearer for us, since you don't mention that it is isolated to this network.

If it's located to this network, did you reset the router or firewall to see if that worked?
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hmarcbowerCommented:
Actually, what you said was that it didn't work on your network until you did a system restore.  Then when you sent it back to the customer it didn't work again. That sounds like a *re* infection to me.  Run HiJackThis and attach a log.

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OOsorioCommented:
What changed on this PC. Has new software been installed; Symantec, McCafee, AVG. What about the IP settings. Is this computer getting the proper IP and gateway? Maybe somebody changed, completely or partially, the IP settings. What about the DNS settings?
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pagoscheCommented:
Try going into the tools menu of internet explorer and choosing internet options.  Click on the connections tab and then click on the LAN settings button.  Check the box "automatically detect settings" and nothing else.  Then try going to a webpage.
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CompTroubAuthor Commented:
all other pcs work on the network. Tried LAN options. Yes initially only worked after sys restore but for the 2nd time work right a way on our network.Nothing has changed to our knowledge.I think you guys are trying to concentrate on the pc but I suspect it will be a networking issue.And is not an infection pc is clean.

Cheers
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edbedbCommented:
I know you reset it but try WinSock XP Fix anyway, you can get it here. http://www.snapfiles.com/get/winsockxpfix.html
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hmarcbowerCommented:
Which doesn't explain why it didn't work on your network until after a system restore...
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CompTroubAuthor Commented:
as I mentioned it work OK the 2nd time without sys res and all other clues were pointing towards the router which I also pointed out..
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CompTroubAuthor Commented:
Resolved myself
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