I'd say you're already loaded with more freebie scareware than anyone needs. :~D
I've only ever used MS antispyware, and a commercial antivirus, currently Trend's PC Cillan. I've not had ~any~ spy or malware problems, ever. (one exception that was my fault)
I think the rest are at best overkill, and at worst, potentially the source of all evil. :~D
I'll second that..
I've had cable internet for years now and I run a hardware firewall and AVG anti-virus and I have picked up one virus in 4 years and that was that damn windows messenger one.
Smart surfing is your best defense.