username@statse.webtrendslive.com Cookie

I have a user that has a tracking cookie that continously turns up on our daily report. Symantec Endpoint Protection scans his computer once a day, locates and deletes the cookies, only it turns back up the next day. I have cleaned out this temp files and had him restart his machine after scanning and cleaning out temp files in case the cookie resides in memory, still the same issue. My question is, I am looking for a resolution to completely remove this cookie from the user machine so that it doesn't turn back up on our reports.

Thank you!