DNS server address keeps changing by itself

I have an XP PC on my network and it's TCP/IP setting for DNS server address keeps changing by itself. Other PCs are OK. I set it to 'obtain DNS server address automatically' but it keeps switching to 'use this address' and there is an IP address entered. I searched the knowledge base and one article suggested malware. I ran a full scan using Virgin PC guard (virus and spyware) and that found nothing. I then downloaded Spybot S&D and ran that and it also found nothing. PC guard has been on all the time and hasn't detected anything.

Not sure what to try next...

Thanks
Mark PrestonSystems EngineerAsked:
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Kruger_monkeyCommented:
Is the ip that it assigns for DNS your routers ip by any chance?

I wonder if this is a UPNP type problem?  

also you can try resetting the ip stack on the machine.  See the following article to find out how to do that.

http://support.microsoft.com/kb/299357
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leegclystvaleCommented:
Have you reset the IP stack? Just a source to rule out.  From a command prompt type>
netsh int ip reset c:\resetlog.txt
This will hopefully sort out any stuck registry settings that may be causing it.
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Mark PrestonSystems EngineerAuthor Commented:
I'll try this as soon as I get home - thanks
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Mark PrestonSystems EngineerAuthor Commented:
Reset the IP stack using netsh int ip reset c:\resetlog.txt
internet access seemed much quicker and the DNS address stayed at '..automatically' for quite a while (enough for me to think that all was fixed) but 20 miniutes later it was back to 216.146.35.35 (which isn't my routers address) so not there yet.........
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optomaCommented:
That address is belonging to DynDns.com

Any of their updater software on that machine?
http://www.dyndns.com/support/clients/#what
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leegclystvaleCommented:
Has the PC only got one NIC?
 
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Mark PrestonSystems EngineerAuthor Commented:
I do have Dynupdater on the machine & it only has one NIC
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optomaCommented:
Can you uninstall it temporarly and see if that makes a difference
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Kruger_monkeyCommented:
Ah you are using dynamic DNS.  That will probably be what is changing/updating your DNS settings.  When it changes does it affect your browsing/connectivity at all?  I suspect not, this is normal behaviour for dynamic dns client as far as I know.

Do you connect to your pc from outside, is that why you are using dynamic dns?  If so you will probably want to keep it on.  But to verify that it is the updater resetting it, do as optoma suggested and uninstall it.

Should be fine either way.
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Mark PrestonSystems EngineerAuthor Commented:
I have a home server on the network that I can get into from the outside - or rather 'I have a home server on the network that I SHOULD be able to get into from the outside.' It was while I was investigating why I could not get to the server that I found that the DNS settings were playing up. Will turn off the updater first thing tonight and post straight back. Thanks.
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Mark PrestonSystems EngineerAuthor Commented:
If I turn off the updater and change the settings to 'automatic' then it stays put - so I guess that I didn't have a 'problem' in the first place!! Thanks!!
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optomaCommented:
You're welcome :)
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