How to detect a malware in Mac OS X Lion

Hello,
I am not a seasoned Mac user. I heard that Mac doesn't have malware like Windows.
Last night I carelessly downloaded something (from Google talk) from the link http://bitly.com/wEV7Hy?id=a4a4a6
It has a zip file, within that a .scr file.
Can any one please tell me whether it's a malware or not.
Thanks in advance.
Sudip
(PS. I am not sure whether it's ok to share a link in this manner. If it's not legal, pls tell me.)

If you are wanting to re fresh a page in safari click on the clock wise arrow next to the RSS icon in the address bar. This is a link that may help http://support.apple.com/kb/HT4550

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How to detect a malware in Mac OS X Lion

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