User can't access a few websites

I have a user in the office that all of a sudden cannot access a few websites.  They are going through a net gear router that is not configured on the network.  I just bought one and plugged it in and put a password on it.  Anyway, it has been working for him for 2 years.  Last week he could not get to a website.  I went into the properties of the wireless connection and changed the dns settings from automatically detect settings to the ISP forwarder.  It was referencing the server dns.  This worked and everything is fine but it seems to reset itself.  Not sure if it is when he reboots or what.  He couldn't get on a website again this morning and I looked at the TCPIP settings and it went back to automatically detect settings.  I changed the DNS address and everything is fine.  So, 2 questions.  Why did this start in the first place, and why won't it stick to the static ip I give it for DNS?
mkramer777Asked:
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web_trackerComputer Service TechnicianCommented:
It could be a third party software that is managing the wireless network settings instead of windows managing these settings. Are all the pcs in the office the same, and is this the only user that is experincing this problem. Do end users have the liberty of installing their own software? If so I would check to see if the end user installed some type of third party software that manages their dns settings.
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mkramer777Author Commented:
Only this pc is having trouble.  There is no 3rd party software installed managing DNS.  Is there a way I can make the DNS static and not jump back to automatically obtain?
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mkramer777Author Commented:
I had this user hook up to another wireless router at another business and he was able to get on the website.  Still cannot access the website at this location.  If I change the DNS from automatically select to the DNS of our internet service provider, everything works fine.  Any ideas on what to do?  Is it a netgear router problem?
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