Have look at this, Liz, is your warning the same as the one on the site?
http://botcrawl.com/update-google-chrome-virus-removal/If it is you might need to do some work. I have checked out the links to CCleaner and Malwarebytes and they are OK but you might already have those.
I would also uninstall Chrome nd get the latest version from here:
http://www.google.co.uk/chrome/ and set it to update automatically. You will lose all your password and form filling, but it is a small price to pay.