Im very careful about avoiding viruses. I have an always up to date av, I scan files before and after downloading them, before running any executables or unzipping files. However when browsing online today I clicked a gamefaqs article about a particular game. After reading for a second I was redirected to a fake virus warning webpage. I alt+f4 out then I started up a full pc scan and also checked the original url on virustotal which scans urls for viruses and so forth. virus total showed the url as being clean. My pc doesn't have any viruses, I check regularly and practice safe online browsing, so how does a supposedly clean url on a reputable site redirect me to a fake virus webpage?