Security software from major vendors can take two days to block a Web site designed to attack a computer visiting it. NSS Labs tested security software suites against fresh malware released on the Internet. As many as 50,000 new malicious programs are detected every day. Best vendor was able to block new sites only 60.6 percent of time; at the bottom end, software could do that less than 44 percent. The test mimics how average people browse the Web, finding potentially malicious Web sites and then visiting them with a browser.”]