Remember that no legitimate anti-virus company will perform an unsolicited scan of your computer and ask for payment to correct issues identified.

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The notice may ask for payment or it may request more information.

FORBES: Tax Tip #2: Dealing With IRS Notices

Mr. Chan predicted that the next phase of offshore yuan trade would involve "more balanced flow between the mainland and Hong Kong, " with Chinese currency moving in both directions as more Chinese exporters ask to accept yuan in payment for their goods from overseas buyers.

WSJ: The View From Hong Kong: Walking a Fine Line on Yuan Trade

In one conversation with a confidential informant recorded by investigators, Morejon demanded thousands of dollars in payment for Cuban birth certificates and provided advice about how to answer questions from immigration authorities who might ask why he has a Mexican accent.

CNN: STORY HIGHLIGHTS