How to remove this weird box in Google Chrome?

Chrome Behaving Strangely Pop Up

If you notice Chrome behaving strangely (for example, showing you unusual startup pages, toolbars, or pop-up ads you can’t get rid of), it may be due to an unwanted program on your computer.

You may be able to fix the problem by downloading and running the Software Removal Tool. Think of this as a “factory reset” of Chrome. It restores Chrome's original settings and removes programs that affect its behavior.

Set up the Software Removal Tool

The Software Removal Tool scans your computer for programs known to cause problems with Chrome, and then offers to remove them for you.

Download

Visit the Software Removal Tool homepage.

Click the Download button.

Review the Terms of Service and Privacy Policy. To agree, click Accept and Install.

The Software Removal Tool will download to your computer.

Scan your computer for unwanted programs

Open the Software Removal Tool. It will immediately start searching your computer for suspicious programs.

A message will tell you how many programs were found, if any.

Click Remove suspicious programs. Wait until you see the message "Removal complete." Some open applications may be closed in the process.

Click Continue to quit the tool. (If your computer needs to reboot, the button will say Restart.)

Chrome will automatically reopen, asking you to reset your browser settings. Click Reset.

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You said that it won't remove from your extensions--When you remove it, does it just come back? Or is it just not there? Either way, try searching (in windows, hit the start menu button and just search) for "Nation Zoom" and a program of some sort might pop up. Hit "open file location" and delete the whole folder if you're sure that it is in fact this "Nation Zoom" thing. Alternatively, you can probably go to "uninstall a program" (search for it in the start menu) and look for weird programs that you didn't install and look suspicious. After you think you've uninstalled it, go to chrome's settings and set your "on startup" option to "open the new tab page."

go to chrome://flags/. and at the upper right position, you will see, "reset to default".click it and every thing that you edited in the chrome flags will be back to default