Best Security and Optimizing Setting & Programs

hi
i just wana know which program and setting is best for a amd2400+512mb ram+80gb hard for a small shared hosting,

i installed zend and mmcache , also i changed some thing for smtp on cpanel,

and what i should install for security and optimizng programs ,?
anti virus , anti spam , monitoring , & ..


also a good setting for my sql and apache,

thanks

 

 

 

 

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