Superfish snoops in on your web browsing and secretly slips ads into webpages. But the really dangerous part is that it’s pre-installed with root certificate authority, which allows it to impersonate any server’s security certificate.
To remove the Superfish program and its certificate from your computer, please use this free tool from Lenovo as published by AVG: http://www.avg.com/campaign-landing-pages/ww-en/lenovo-superfish