Comparison between protection softwares?

From below which software do you recommend

1.AVG Antivirus(Free Edition) OR Norton security scan(Free Edition)

2.Spybot search and destroy(Free edition) OR Spyware doctor starter edition(Free Edition)

If you have any other better softwares than these which are “LICENCED FREE” please do share it here.

Thank you

avast home edition http://avast.com
SUPERantispyware http://superantispyware.com
spybot search and destroy

http://www.safer-networking.org/index2.html

ccleaner http://ccleaner.com [Use the ccleaner and registery scans daily]
These are all free and come highly recommended. I suggest you read about them so that you use them correctly.