When in doubt, SCROLL UP. LOL.
With regard to anti-virus software, I just yanked Norton off my PC again yesterday. I've had it. I put AVG Free on it, from Grisoft. It works a bunch better, anyway, and it's free, and doesn't suck CPU and memory.http://free.avg.com
Malware guys are exploiting lots of issues, and the browsers have gotten stricter, and the malware / AV programs are scanning more stuff. I've seen many a non-up-to-date computer get hooked off of an exit script from a web page.
Keep your PC updated. With Grisoft AVG being free, there's no excuse for not having a virus checker. Most importantly don't do business with dirt bags like porn operators.