Yes, This is possible to block the specific site with the help of Parental Control option if you are using Quick Heal 2011 or 2012. Please follow the steps to do so.
1. Open Quick Heal Window and Click Internet and Network
2. Click Parental Control , click "Not Configured" words to configure it.
3. Enable the option Restrict Access to Particular website.
4. Add the site name and and save it.