Warning boxes for viruses and **** ads

I bought a used mac from a reputable mac store two weeks ago.  I was told I didn't need virus protection.  But this morning when i turned on my computer, i got a bunch of warning boxes which now keep repeating in the corner telling me my mac in infected. 
And sure enough starting this morning, i am now getting sites popping up for ****.  So i certainly have something going on.
What should I do?  Do I need to buy virus protection software?  How do i get rid of these new ads for ****?
Thank you

It's malware, not a virus.
Follow the instructions at both of these links.
http://www.fixkb.com/2011/05/remove-mac-protector.html
http://www.macrumors.com/2011/05/02/new-macdefender-malware-threat-for-mac-os-x/

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