The Spyware & Adware Epidemic

Do Anti-Virus/Spyware expire?

I bought a used laptop that had an antivirus software in it already.Every time I check the date it expres it says the same day I log on except next year.Like When I checked it on August it was supposed to expire august 2010.Now that I checked on Dec 2009 it says it now expires Dec 2010.Is this common cause I was getting ready to get a free antivirus once this one expired.

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