Try disabling the McAfee network agent service. Run > "msconfig" > Services. I disabled the mcafee network agent and the mcafee firewall core service. 

This solution fixed it for me!

3 month old Dell laptop, preinstalled with McAfee trial suddenly had this "Unidentified Network no internet access". Thanks to this forum for the solution.

Hi,  

Welcome to Microsoft Windows 7 Answers Forum!

  
To troubleshoot your issue you may try the below methods one by one.
 
Method 1: Update the network driver.

Steps to update network driver:

1.    Click on start button. 
2.    In the search box type devmgmt.msc and then press enter.
3.    Select the network card device and right click on it
4.    Now select properties.
5.    In the properties window, under Driver tab, click on Update Driver button.
6.    After the installing the updates restart the computer.

For more information visit: http://windows.microsoft.com/en-us/windows7/Update-a-driver-for-hardware-that-isnt-working-properly 

Method 2: Try resetting the TCP/IP stack.
 
To reset the TCP/IP stack go to this article and either click on "Fix it for me" or follow the instructions to fix it yourself: http://support.microsoft.com/kb/299357 .

If still the same problem persists then try the next method.

Method 3: Here you need to troubleshoot using the Network troubleshooter in Windows 7 and check for the issue to do that follow the below provided link.

http://windows.microsoft.com/en-US/windows7/Using-the-Network-troubleshooter-in-Windows-7

Hope this helped

Thanks and Regards:

Suresh Kumar- Microsoft Support.

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