Microsoft and Some Third Party Scanners

Microsoft Security Essentials

Microsoft Safety Scanner

Vipre

Norman

Eset

TDSkiller

Microsoft Standalone System Sweeper

McAfee Stinger

Virus Information Alliance (VIA)

Secunia Personal Software Inspector

Other Tools (read about them before using)

AVG Rescue

WinPatrol

BitDEfender TDL4 removal

ESET Smart Installer

F-Secure online scanner

F-secure Rescue CD

GMER Rootkit remover

Hijackthis

Kaspersky Virus removal tool

Malwarebytes free and Pro

McAfee Stinger

Microsoft Safety Scanner

Norman Malware Cleaner

Norton Bootable Discovery Tool - Fix infected PCs

Online Virus Scanners (10 tools)

Paragon Rescue Kit

RKill

Rootkit revealer

Sophos Anti Rootkit

Spybot

SuperAntiSpyware portable

TDSSKiller

Threatfire

Trend Micro RUBotted

Vipre Rescue

Virus Info Alliance

Windows Defender Offline (32-bit and 64-bit)