Before we all start coming up with complicated ideas, try the old trick of turning it off and turning it on again!
i.e. close Chrome, shut down your computer, wait 30 seconds, boot up your computer again, try Chrome again.
If you can't access the 'X' to close Chrome, right-click on your task bar (at the foot of your screen) and select 'Start Task Manager'. If the 'Processes' tab isn't pre-selected, click on it. Click on 'chrome.exe' and then on 'End process'. When you're warned that the world will end if you proceed, go ahead anyway ;-)