I got one of these calls last week. When I told the caller he was full of BS he still kept trying to get me to boot my computer...relentless. I finally had to hang up on him.
http://www.google.com/#hl=en&cp=22&gs_id=2f&xhr=t&q=phone+call+telling+me+i+have+a+virus&pf=p&sclient=psy-ab&site=&source=hp&pbx=1&oq=phone+call+telling+me+&aq=0&aqi=g1&aql=&gs_sm=&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=276e81f590f7945&biw=1219&bih=926
http://www.google.com/#hl=en&cp=22&gs_id=2f&xhr=t&q=phone+call+telling+me+i+have+a+virus&pf=p&sclient=psy-ab&site=&source=hp&pbx=1&oq=phone+call+telling+me+&aq=0&aqi=g1&aql=&gs_sm=&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=276e81f590f7945&biw=1219&bih=926