How do I remove a virus from my iMac?

My computer has a virus.  I don't know what to do about it.  MacKeeper was downloaded when I tried to update a Flash player.  Now I'm having lots of problems and pop-ups.  I trashed it and securely emptied the trash but I'm now getting messages that I have probably 2 viruses.  I don't trust where this information is coming from and wonder how I can get rid of the viruses.  I don't want to give anyone access to my computer to fix it online when I don't know who they are.  Can I take it to an Apple Store or an Apple authorized dealer?  Please help!

For Alan and Kurt,
Thank you so much for your help.  What a relief.  I used the link http://www.adwaremedic.com/index.php and it cleaned everything out in less than a minute.  It had commandeered my Home Page, but I got that back now and so far no pop ups. 
~~Margo

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