Using a public DNS address is a common solution to not hosting your own DNS servers. Public DNS servers are hosted for your use as an alternative method of configuration, public DNS servers also provide a excellent tool for trouble shooting suspected DNS issues.
If you are having problems opening a specific web site you might need to adjust the DNS settings for your internet browser.
Navigate to the following google web site for step by step instructions. http://code.google.com/speed/public-dns/docs/using.html .
I have also created a short version for you here.
Open up the properties dialog of your internet connection Local Area Connection Properties and open IPV4 dialog.
Select the Advanced button select the DNS tab and then click ‘Add’
Inside the DNS server dialog add the Google server address of 126.96.36.199 click Add and then repeat the process adding 188.8.131.52
Click OK then OK then OK again if needed to close the network properties dialog box.
Now close and reopen your internet browser then attempt to go to the web site that would not open previously.