Software

Anitvirus

• Ad-Aware Free
• AVG Anti-Virus Free Version
• Microsoft Security Essentials
• avast! Anti-Virus Free Home Edition

Anti-spyware/malware

• Malwarebytes
• Spybot Search & Destroy

Open Source Software

• Firefox – Web Browser
• Thunderbird – Email Client
• LibreOffice – Office Suite

Need help keeping your software up to date

• Secunia Personal Software Inspector

Looking for an alternative to Windows, try Linux!

• openSUSE