Alwaysecure.net 
This site offers a good roundup of freeware programs to keep your PC safe and secure against the various hazards that lurk in cyberspace these days, including spyware, viruses, spam, and more.

 Scan Complete 
This site offers a roundup of freeware anti-virus and anti-spyware programs. You'll also find freeware programs to help you battle spam, as well as remove adware from your computer.

 Trend Micro HouseCall 
A free Web-based anti-virus tool that lets you scan your PC for viruses, spyware, worms and other digital threats. The program then displays a list of any infected files it finds and allows you to remove them from your computer.

 PC Security Test 
How secure is your computer? This freeware program checks your computer's security against viruses, spyware and hackers and grades the effectiveness of your protection software (including anti-virus programs, spyware scanners, and firewalls). (Windows).

 Free Norton anti-virus software 
Follow the instructions here to request a free version of Norton SystemWorks. This popular program includes utilities that protect your PC against virus threats and help you recover from system failures, etc. You must be 18 or older to request this item. Allow 6 to 8 weeks for delivery. (U.S. only).

AVG Free Edition 
Here's an outstanding freeware anti-virus utility that also offers you free monthly updates. An easy-to-use program, AVG features resident protection, an E-mail scanner and automatic healing of infected files. Note: this program is free for personal, home usage only. (Windows).

VCatch Basic 
Are you worried about getting a virus in your E-mail? This free program aims to help you to protect your computer from receiving virus infected E-mails. When an incoming E-mail or file is suspected to be containing a virus, VCatch automatically deletes it and notifies you. (Windows).

 AntiVir Personal Edition 
This easy-to-use freeware antivirus utility detects over 80,000 viruses and includes a resident monitor and desktop program. Scans for DOS, Windows, macros and Java viruses. Available in German and English. (Windows).