|Most of the time when this happens it is a virus. You need to check your proxy settings.|
Open Internet Explorer by clicking the Start button, and then clicking Internet Explorer.
Click the Tools button, and then click Internet Options.
Click the Connections tab, and then click LAN settings.
Un-Check the Use a proxy server for your LAN check box.
Now download Malwarebytes and Super AntiSpyware and scan your system.