Trend Micro HijackThis™

Trend Micro™ HijackThis™ is a free utility that generates an in depth report of registry and file settings from your computer. HijackThis makes no seperation between safe and unsafe settings in its scan results giving you the ability to selectively remove items from your scan results identified as malicious or unwanted from your machine. In addition to this scan and remove capability HijackThis comes with several tools useful in manually removing malware from a computer.

*Trend Micro does not officially support HiJackThis.

http://www.trendsecure.com/portal/en-US/threat_analytics/hijackthis.php