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Most computer users have no idea how dangerous their online behavior is.

No matter how many times you warn them, employees still manage to poison their computers with new malware because they “just couldn’t resist looking at the attachment.” Other common goofs: downloading software for personal use, lowering firewalls to speed up a connection and even leaving their passwords stuck to their laptops.

The following is our list of the ten most dangerous things people do online, along with some explanation of the risks associated with each. The list is based on input from information technology professionals and is arranged in descending order of danger.

Stick this list up on your office door. Better yet, post it to the company bulletin board. If it keeps just one person from making a big mistake, it will have been worth the effort.

The Ten Most Dangerous Online Activities:

1. Clicking on e-mail attachments from unknown senders
2. Installing unauthorized applications
3. Turning off or disabling automated security tools
4. Opening HTML or plain-text messages from unknown senders
5. Surfing gambling, porn or other dicey Web sites
6. Giving out passwords, tokens or smart cards
7. Random surfing of unknown, untrusted Web sites
8. Attaching to any old Wi-Fi network
9. Filling out Web scripts, forms or registration pages
10. Participating in chat rooms or social networking sites