ENSURE THAT YOU UPDATE YOUR INSTALLATION TO HANDLE VIRUS DAT FILES AFTER 980
http://www.trendmicro.com/en/support/npf/overview.htm
HOVER OVER THE BLUE DOT IN THE CORNER, IF IT SAYS “980“ YOU ARE IN SERIOUS NEED OF THIS HOTFIX/SERVICE PACK.
http://kb.trendmicro.com/solutions/search/main/search/solutionDetail.asp?solutionID=19744