Can only say what I use for W7 64bit.:
Firewall: PCTools (ZA did have some problems with AVG)
Anti Virus: I use Avira, but am sure Avast is good. Some prefer MS Security Essentials.
Anti Malware: Superantispyware and Malawarebytes, (and Spywareblaster to try to prevent stuff.) I find that SAS fids stuff that MAB sometimes does not.All the above are free.