Certain types of viruses specifically target Web browsers by changing the default home page or search engine, automatically opening pop-up windows containing ads or redirecting users to websites affiliated with the creators of the malware. If such a virus has infected your Google Chrome browser, remove the virus using anti-virus software, and reset Chrome's settings.
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Remove the Virus From Your Computer
Reset Chrome's Settings
Resetting Chrome's settings brings your browser back to a near out-of-the-box state, therefore undoing any changes a virus may have made to your home page, default search engine or startup tabs.
Open Chrome's Settings page by clicking Settings in the Chrome menu.
Click the Show Advanced Options link to reveal the browser's advanced settings.
Click Reset Settings.
Select Reset to finish the process.