Just 3 out of 100 Internet users are able to sniff out sites ready to drop spyware or adware onto their computers...In an online quiz run by McAfee's recently-acquired SiteAdvisor...97 percent of more than 14,000 consumers were fooled by one or more malicious sites...Based on the survey's results, 65 percent of the users would have been infected several times with adware or spyware...The SiteAdvisor "Spyware Quiz" can still be taken, and is available here.