If free anti virus/spy progs. are so effective then why do mcaffe.nortons etc. charge?

Thanks folks, My earlier query regarding the anti virus v/s. internet security has recd. a tremendous response. However most of you recommended free anti virus or spy removal tools progs.to be downloaded from various sites. I wonder ! if the sites providing free virus/spybot/adware etc. removal tools are so... show more Thanks folks, My earlier query regarding the anti virus v/s. internet security has recd. a tremendous response.

However most of you recommended free anti virus or spy removal tools progs.to be downloaded from various sites.

I wonder ! if the sites providing free virus/spybot/adware etc. removal tools are so effective. Then how come the Mcaffe's & Nortons & Kasperskys etc's. are charging for their Computer security programmes?

I mean to ask, are these sites offering free anti virus/spyware/adware etc. removal tools really trustworthy?

I would like to know if any of the users have any negative experiences after having downloaded any of the these free comp. security progs.?

My belief is nothing comes for free, everthing has a pre-condition attached to it even if its provided without any charges.

Can any of you experts enlighten me?
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