Do you think my computer is secure?

Ok here are the security products i have on my computer:

Anti-virus = Avast! home edition

Spyware detection/removal = Superantispyware

Spyware prevention = Spyware blaster

Firewall = Zonealarm

Ok i really need to know what you guys think and if you could rate between 1/10 or if there was a free way to boost my protection tell me.
Sorry forgot to add that i have ccleaner

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