A number of users have reported an issue in which Windows 7 displays a message indicating that there is “no Internet Access,” accompanied by a yellow exclamation point warning sign, despite the fact that Internet access works properly in all applications.
Disable link scanning in antivirus/malware software The number one cause of this issue is problematic link scanning functions in various antivirus/malware software packages. Try disabling any link scanning components, then restart and check for Internet access.
For example, you can disable AVG’s link scanner by clicking on the AVG icon in the task bar (lower-right hand corner) then selecting “Link Scanner” and unchecking the “Enable AVG Search-Shield” box.
Look for a similar Web “link scanner” or “web shield” component in your antivirus/malware package and temporarily disable it, then restart your computer and check to see if the problem still exists.
Disable then re-enable antivirus software In other cases, simply disabling then re-enabling antivirus software can resolve this issue.