Trend Micro PC-illin
AVG Anti-virus
Trend Micro HiJack This

The most comprehensive anti-virus on the market
A great free anti-virus
Detects changes to your PC and returns a report (free)

The best Windows optimizer available. All PC's should have this!
Free's used RAM to help your system function smoothly

Monitor your network and manage Windows remotely
Test and troubleshoot your broadband connection's speed
Monitor and record events while you are away from home
View and control remote computers securely and in real time

Get access to your PC no matter where you are
Share files and folders over the Internet using a virtual LAN
Connect and control remote computers running VNC