Hmmm... I wonder which of Internet Explorer vulnerabilities are causing Ruby's problems? It pretty much goes without saying that he visited the wrong site and got some sort of trojan/virus/spyware installed on his computer. Pretty sure it wasn't PGC, as nobody else really has those problems. I know that I don't, but my browser is free of ActiveX and VBScript, which... I am quite happy about.
Sorry, 2 more things.
Firebird blocks the ad from displaying, not loading. I don't think it's possible for advertisers to know the difference. Besides, if you REALLY want to see the ads, you can unblock sites, but the default is blocked.
PaleZero, don't know what to tell you. It sounds like you might have a bug in your profile or something. Try erasing your profile and starting again from scratch. Although I have personally never had the problem, I have heard that if you switch versions without clearing your profile, you can have problems. (I frequently use the nightlies though... and I have not had an appreciable number of bugs)