Cookies are short text files which are saved on your computer. They contain information about which sides you visit on the internet. No personal data are saved in our cookies and they can not contain harmful virus.
If you do not want to accept cookies you can set up your browser to automaticly reject cookies or to warn you everytime a website wants to save cookies on your computer. Use your browser's help function to learn more.
How to delete cookies:
Follow this guide: http://www.allaboutcookies.org/manage-cookies/