Not all free, and I borrowed the list from another forum but still good all the same and worth posting IMHO that is 
many thanks to Rollin Rog for his time and effort
Best Online Scanners:
HouseCall
Panda
RAV AntiVirus Online
Libraries and further information:
Symantec
Trend
McAfee
Sophos
Panda
Security Intelligence (a broad collection of informational sites)
sleekluxury's Guide to Internet Security
Free fix and removal tools:
Viral:
Grisoft AVG Free Download
Specialized Removal Tools from Grisoft AVG
Symantec
Trend Micro Damage Cleanup Services (uses the latest definitions, downloadable)
BitDefender
McAfee AVERT Stinger (Stinger is a stand-alone utility used to detect and remove specific viruses)
Specialized Trojan Removal Applications (trial versions):
Wilders Security Advisors
Parasitic:
Spybot Instructions and Download
Ad-Aware Home Page and
Ad-Aware 6: Reference Guide by Winchester73
HijackThis Instructions, download, and
Tutorial
lspfix (Layered Service Protocols) repairs damaged Winsock2 vxd associated with connectivity problems
SpywareInfo: Detection, Prevention and Removal Tools, SpywareBlaster and others
Parasites
RapidBlaster Removal
CoolWebSearch -- Information and Removal Tool
Kazaabegone and other downloads from Merijn
Alternate Download Sites for HijackThis, Spybot, CoolwebShredder:
Lurkhere
HijackThis at Spychecker
Spybot download and Turtorial at Safer-networking
CoolWebShredder at Majorgeeks
Free Firewalls:
ZoneAlarm
Sygate
Kerio
More FireWall help and info
Vulnerability testing, Information and Fixes:
Steve Gibson's Homepage
Are you safe? Gibson's site is a world of its own, with tests and fixes for many Windows security vulnerabilities.
Security Test Sites
Microsoft Security Information:
Security and Privacy
Home Security Risk Assesment and Protection Steps