Here is a short list with the most important tips that anyone should consider when their computers are connected to the Internet.

1. install antivirus software
2. use a firewall
3. download security patches for your application programs
4. use different passwords for your accounts and change them periodically
5. delete spam messages and don’t open attachments without knowing if the source is trustful or not
6. do not download free games, freeware or other application unless you are certain they are harmless
7. protect your wireless and wired network
8. backup your computer
9. password protect important files
10. don’t publish personal information over the Internet

Did I forget an important tip? Let me know and I will add it to the list.