Below are my favorite FREE diagnostic & removal tools.
*Use them at your own risk*

Don't spend money on antivirus software. There is no silver bullet that can prevent every virus infection.
Most virus infected PCs I clean up have either Norton or Mcafee installed so I don't recommend them
or any other antivrus program you have to pay for. Instead choose a free program from the middle column.

Virus / Malware Removal Use these free tools if you know that you have a virus	Virus / Malware Prevention Use these free tools to prevent virus infections	Miscellaneous Programs
Malwarebytes (my favorite)	Microsoft Security Essentials	CCleaner  (**) (Run this often!)
HitManPro	Panda Cloud	K9 Internet Filter (A must for kids on the internet)
	AVG Anti-Virus	Google Chrome (Still using Internet Explorer? Stop!)
IObit Security 360	AntiVir	TeamViewer
Dr. Web CureIt!		Startup Manager
	Norton Removal Tool	Glary Utilities
	McAfee Removal Tool	Comodo (Free Firewall)
Advanced Removal Tools		Process Explorer (from Sysinternals)
Hijack This		System Information
Hijack This Analyzer		TFC Temp File Cleaner (by OldTimer)
ComboFix
TDSSKiller (Anti-Rootkit)		Stock Volatility Stop Calculator
VundoFix
CWShredder
Specific Fixes
And More		Online Tools That Clean Up HTML

 

Online Virus Scanners	Utility CDs	Miscellaneous Links
Eset Nod32	BartPE (bootable Windows CD)	MajorGeeks Checklist
Kaspersky	Trinity (reset Windows passwords)	KRC Checklist
Trend Micro		How to Remove | How to Remove2
BitDefender		Symantec Removal Tools
Panda		F-Secure Removal Tools
Ewido		Doxdesk Parasite Detector Page
		Windows Update
		KRC Forum
		TechSupportForum
		MajorGeeksForum