If there is only one startup page and the default startpage is removed, you should create a new preferred web address by clicking Add a new page and type to set Google as your default startup page.Click on the X button to remove the unwanted or hijacked startpage from Google Chrome.Scroll down to the ‘On startup’ section with the option ‘Open a specific page or set of pages’ and click on Set pages.On the left side menu, click on Settings to display current configuration of Google Chrome.Locate adware or Potentially Unwanted Program and click the Trash icon to delete the malicious extension.It opens a window showing all the installed Extensions and plug-ins of Google Chrome. Select now the option Tools, then, click on Extensions.