Hi, am running joomla 3.3.3 and i installed k2 component in my website. under K2 user registration... am receiving spam user registration.... how do i stop that spam registration? check the image here imgur.com/vi6635d

By enabling reCaptcha on the registration page.
This setting is located in K2's params.

Thank you ave seen it and have enabled.. will check again later.. thanks alot was really a headache.

Keep in mind that if these spammers are real people the recaptcha will not work, it will only slow them down. Consider adding a stopforumspam.com key (also located under K2 params) if the issue persists.