The 100 websites most affected by viruses each have about 18,000 nasties to attack net users' computers, according to insecurity outfit Norton Symantec. Visiting one of the "Top 100 Dirtiest" websites, without downloading or even clicking anything, could expose your computer to infection and put your personal information into the hands of criminals, the outfit said.

The list was compiled using global data collected on Norton Safe Web, a site that analyses websites' security risks and has 20 million users providing site reviews. The top 100 infected sites had on average 18,000 threats and 40 per cent of the sites had more than 20,000 threats. A staggering 75 per cent of websites on the list were found to be distributing "malware" for more than six months.

More than half of the websites on the list had porn but some where not so easy to spot as they included sites about ice-skating, deer-hunting, catering and legal services.

Websites that made the list include:

* 17ebook.co

* aladel.net

* bpwhamburgorchardpark.org

* clicnews.com

* dfwdiesel.net

* divineenterprises.net

* fantasticfilms.ru

* gardensrestaurantandcatering.com

* ginedis.com

* gncr.org

* hdvideoforums.org

* hihanin.com

* kingfamilyphotoalbum.com

* likaraoke.com

* mactep.org

* magic4you.nu

* marbling.pe.kr

* nacjalneg.info

* pronline.ru

* purplehoodie.com

* qsng.cn

* seksburada.net

* sportsmansclub.net

* stock888.cn

* tathli.com

* teamclouds.com

* texaswhitetailfever.com

* wadefamilytree.org

* xnescat.info

* yt118.com