Open your browsers and manage search engines, remove InBox. Also remove related browser plug-ins/add-ons/toolbars. Set your home page to whatever you desire. Finally, check your machine for adware/spyware.
To remove Adware/Spyware you should do the following:
Run the free version of two of the following: Spybot Search & Destroy, Adaware anti-spy, SuperAntiSpyware, AdwCleaner.
Next install and run malwarebytes free version.
Now, run one of the following:
CCleaner, Glary Utilities, Tweaking.com Windows All In One tool.