An estimated 300,000 computers, most of them in the United States, Italy and India, could be infected and lose their Internet service, Queen's University associate professor Thomas Dean said Friday. Dean said Canadians can go to www.dcwg.org to check if their computers are infected and take appropriate measures. If computers have been infected due to the scam, they haven't been able to perform anti-virus software or system updates, leaving them vulnerable to other malware, said Dean, who teaches in Queen's University's department of electrical and computer engineering.