HijackThis - HijackThis is a malware detection and removal tool that's ideal for users who demand more granular control over every aspect of their computer's performance.
MBRCheck - MBRCheck identifies infected Master Boot Records (MBR).
GMER - GMER is an application that detects and removes rootkits .
Spybot - Search & Destroy - Spybot Search & Destroy is an anti-malware, adware and antivirus program for safe removal of the threats from the PC and browser.
RootkitRevealer - RootkitRevealer is an advanced rootkit detection utility.
ESET SysInspector - ESET SysInspector is a free, state of the art diagnostic tool for Windows systems.