Format slow mac that has internet virus

Hi There,
My macbook pro is very slow and i guess it has virus too. Because whenever i open any new internet page i am always taken to some kind of survey and prize win screen. So i wanted to format my computer to just make it like as it came from factory.
I read internet blogs on how to format computer. I tried erasing the hard drive by going to disk utility. But can't do it as the erase button is disabled even though i select the hard rive at left and go to erase section . I don't remember if i was given any disk when i bought this mac few years ago. It would be great if you can help me fixing my mac .
Thanks,

It does not have a virus.
It sounds more like adware that can be downloaded from shady sites. To get rid of the adware, try http://www.adwaremedic.com/index.php

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