Sometimes it is good to ignore the person or, tell them you have a lot on your mind and need to get your work completed. I usually just tell them that they need to work more and talk less. I am a supervisor and have one particular person that is ADD. He will constantly stop and talk to people instead of being on task. I have reminded him and counseled him many times, finally I gave him a scheduel and spelled out where and when he was to complete each task. I hope for his sake it works because otherwise he will lose his job. I think this person in your workplace is lonely and just wants what everyone else wants.....to be accepted. A nice lunch chat may do the trick, just be up front and honest and tell the person you cannot be chatting all day long when we are being paid to work. Save it for break time or lunch.

Eric