ARCHIVED: When handling Internet files, how can I be safe?

For information about security practices when handling Internet files, see the following:

• Clicking links:
  • Avoid phishing scams
  • ARCHIVED: If I use instant messaging software, how can I keep my computer secure?
  • ARCHIVED: At IU, how can I protect my computer from an email attachment infected with a virus?
  
  
• Instant messaging:
  • ARCHIVED: If I use instant messaging software, how can I keep my computer secure?
  • If your computer is infected with an instant messaging (IM) Trojan
  
  
• Email messages and attachments:
  • ARCHIVED: At IU, how can I protect my computer from an email attachment infected with a virus?
  • Types of attachments blocked from IU email accounts
  • About email fraud
  • About spam
  
  
• Internet files and browsing:
  • About secure websites and SSL/TLS certificates
  • ARCHIVED: In my web browser, how do I know if a site is on a secure server?
  • ARCHIVED: What is spyware or adware, and how can I remove it?
  • ARCHIVED: If I use file-sharing software, how can I keep my computer secure?
  
  
• Running as a limited user:
  • About the principle of least privilege
  • ARCHIVED: In Windows, why should I avoid running my computer as an administrator?
  • ARCHIVED: In Windows, how can I complete a task or run a program as administrator while logged in as a regular user?
  • About Unix sudo and su commands
  
  
• Virus scanning:
  • ARCHIVED: Using Symantec/Norton AntiVirus Corporate Edition, how do I immediately scan a file, folder, or drive for viruses?
  • ARCHIVED: For Symantec virus protection software, what are my options for updating the virus definitions?
  • ARCHIVED: In Symantec/Norton AntiVirus, how do I check the version number of the program and the age of the virus pattern update?