Anti-virus software (AVG FREE)

Please suggest me best free antivirus software for my Laptop?

Windows 8: built-in Windows Defender
Windows 7 or XP: Microsoft Security Essentials

There's also Avira, Avast, and AVG, that first come to mind. I haven't used AVG in quite a while though; seemed to start getting pretty bloated when I last used it.
 
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