DNS Error

My oS is win 7 prof 64 bit and i use Comcast Xfinity for my internet connection.  Although the comcast came with Norton's anti virus I had uninstalled and am using McAfee,.  From time to time I now get a Norton's DNS error message as in the attached file.  And I do not know what to make out of it or why this is happening, and what I should be doing about ti.  Hope the Gurus can please advice.  Thank u.
jegajothyretiredAsked:
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jegajothyretiredAuthor Commented:
aadihCommented:
If you change your DNS setting manually to: 75.75.75.75 and 75.75.76.76, the message would not appear.

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jegajothyretiredAuthor Commented:
In response to aadih, hope u can please let me know how to change the DnS setting manually. Thank u.
jegajothyretiredAuthor Commented:
thank u
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