A significant number of visits to Web pages could place consumer’s computers at risk, security startup SiteAdvisor stated in a recent release. The company, founded by graduate students from the Massachusetts Institute of Technology, uses a legion of automated virtual computers to scan the Internet for dangerous Web sites. SiteAdvisor has scanned sites that account for 95 percent of all Web traffic, rating the dangerous pages as ‘red’, questionable pages as ‘yellow’, and legitimate sites as ‘green’.