Is AntiVirus 2009 safe to run ??

My internet closed & popped up with something saying that I may be at risk against all these viruses etc. I did a scan on the AntiVirus 2009 website & it found many viruses. Then it came up to run it but it then said stopped working. Is this safe? What can I download thats free that will clean my computer & protect... show more My internet closed & popped up with something saying that I may be at risk against all these viruses etc. I did a scan on the AntiVirus 2009 website & it found many viruses. Then it came up to run it but it then said stopped working. Is this safe? What can I download thats free that will clean my computer & protect me from viruses etc????
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