Replying to NS COMPUTER VIRUS?

I got onto NS today to chat away and suddenly my virus blocker told me a Trojan was trying to download itself to my computer. I was on the phone with another NS member and 5 minutes later his computer started to download a virus through his firewall and went through macafee... And basically a fake virus protector was scanning his computer but was actually downloading a Trojan. It pretty much screwed his computer and now he can no longer use his internet and scan his computer for viruses and we were both wondering if anyone else's virus blocker was active while on NS.