I have a problem in my website, I'm not using k2, but I have it installed from a quickstart package from the template developer I use.... and my urls have the k2-tags on them, how to remove this?

for example. http://www .fo rex cast s. com/k2-tags/news/market-news/91-after-a-good-start-europe-is-red-again.html

Why there is the k2-tags on the url? and how to remove it?

Thank you very much

anyone?