How to analyze my website if it has malware or viruses?

There are several specialized websites for analyzing malware on your website:
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​http://quttera.com/home
​https://www.virustotal.com
​http://sucuri.net/
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All these sites will give you information about what has been infected. In case you appear on Google as "This site may harm your computer," once cleaned, you can request a site review in webmaster tools:
​https://www.google.com/webmasters/tools/home?hl=es