Rule One: Don't open email attachments from unknown senders.
Don't open attachments from friends unless accompanied by an explanatory
cover note.
Ensure you have current anti-virus software installed, and preferably
have anti-spam software (like Mailwasher) which will stop most virus attachments
before they can get to your computer.
More Information
on Anti-virus and Anti-Spyware Software
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Books
about computers and the internet
