Today if you search anything on google including, google, yahoo, youtube, cnn you will going to see the msg "This site may harm your computer". First I thought It may be my computer but i used 3 different computer with 3 different IPs and everywhere its same

See Google Serch Example here

StopBadware.org - Welcome to StopBadware.org
This site may harm your computer.
Project being run by Harvard Law School, Oxford University and Consumer Reports WebWatch to develop a clearinghouse for research on badware and those who ...