products linking to strange website

I was wondering if anyone would know why my site has suddenly started linking products to a strange site?

If I click on the products it loads the product page and then instantly tries to load "zypzieb.ru".

If I type in zypzieb.ru I get a message:

This web page at http://www.censored.com has been reported as an attack page and has been blocked based on your security preferences.

Anyone know how I can fix this?

Thanks

Reinstall the latest version. You've got fleas. I'm censoring this thread because it has a link to a malicious web page.