If anyone has something to add, please supply a link in this thread, I'll add it in if it looks good

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Free Anti-Virus solutions The top 3 also have paid versions which offer more functionality
Only run one anti-virus software on your computer
More than one can cause a Conflict, and do more harm than good
In other words: If you already have AV software installed, don't install one of these
unless you intend on uninstalling your current AV first
Avast Home Edition by ALWILAvira AntiVir Personal Edition ClassicMicrosoft Security Essentials=====================================================================
Software Firewalls All have a paid versions which offer more functionality
Only run one software firewall on your computer if needed
This includes the one built into WindowsXP, Windows Server 2003 SP1, Windows Vista, Windows-7
Online-Armor by EmsisoftPrivateFirewall by PrivacywareZone Alarm by Check Point======================================================================
Free Cleaning utilities Tools to cleanup your temp files, cookies and other added features---Please read the instructions before using
CCleaner (Crap Cleaner)Note: Untick the installation of Yahoo Toolbar, unless you prefer to install it
Windows CleanUp! by Steven Gould Internet Sweeper by Allume Systems======================================================================
Free Online Malware scanners (Virus, Trojans, Worms) Ensure you set to Autoclean when possible
Safe to run, even if you have Anti-Virus software installed
BitDefender Free Online Virus ScanEset Online ScannereTrust Antivirus Web ScannerF-Secure Online ScannerKaspersky's Online ScannerPanda's Active ScanTrend Micro's HouseCall================================================
Unsure about a single file on your computer, check it with one of these Online File Scanners
Kapersky's Online File scannerThese next 2 use multiple virus scanners to check if a file is bad
Jotti's Malware ScanVirustotal======================================================================
Free Spyware/Malware Removal ToolsMalwarebytes' Anti-MalwareSuper Antispyware It's free version will detect and remove thousands of Spyware, Adware, Malware, Trojans, KeyLoggers, Dialers, Hi-Jackers, and Worms.
The paid Pro version includes Real-Time Blocking of threats, Scheduled Scanning, and Free Unlimited Customer Service via e-mail.
Prevent Spyware from ever being Installed with these tools
SpywareBlaster 4.6 by JavaCool*Will block bad ActiveX Controls
*Block Malevolent cookies in Internet Explorer and Firefox
*Restrict actions of potentially dangerous sites in Internet Explorer
Use a good Hosts file
Here's a great one, instructions on website
http://www.mvps.org/winhelp2002/hosts.htm