Which version of pc-cillin are you currently using?The reason why I am asking is because I also had the older version, also the latest pattern and when I recently installed pc-cillin2002 with personal firewall(which the old one did not have), immediately it picked up a trojan on my machine(can't remember the name).So, I am not saying it would work for you but it looks like it has improved a whole lot.The personal firewall alone blocked about 7 intrusions the other night when I was on the net at home.

Hope it helps
rergards
v/man