anti spyware help

What is the difference between antivirus and anti-spyware?
Do I need both on my PC? Is it necessary? Please please help
All programs of good coverage of the two! I have published a free good, all in one program on my blog Check it out and try that? http://grizzom.blogspot.com/2009/07/drivesentry-free-security.html
Anti spyware adware Removal Tips Easy & Fast

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