Hi,
1.
What is the exact/complete error message?
2.
Are you using a wired or a wireless Internet connections?
3.
When exactly do you get this error message?
4.
Do you have any third party antivirus program installed on the computer?
5.
Are you disconnected automatically from Internet when you receive this error message?
Method 1:
I would suggest you to refer the following article and check if it works:
Wired and wireless network connection problems in Windows
http://windows.microsoft.com/en-US/windows/help/wired-and-wireless-network-connection-problems-in-windows
Method 2:
I would suggest you to
temporarily disable all antivirus software’s installed on your computer.
http://windows.microsoft.com/en-US/windows7/Disable-antivirus-software
NOTE: Antivirus software can help protect your computer against viruses and other security threats. In most cases,
you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your
computer is vulnerable to attacks.
Note: If you have installed any third party Antivirus software, get in touch with the manufacturer of the software to get help to
temporarily disable it.
Please reply us with the required information to assist you further.