HijackThis™ is a free utility which quickly scans your Windows computer to find settings that may have been changed by spyware, malware or other unwanted programs. HijackThis creates a report, or log file, with the results of the scan.
IMPORTANT: HijackThis does not determine what is good or bad. Do not make any changes to your computer settings unless you are an expert computer user.
Advanced users can use HijackThis to remove unwanted settings or files.
Not an expert? Just save the HijackThis report and let a friend with more troubleshooting experience take a look. A large community of users participates in online forums, where experts help interpret HijackThis scan results to clean up infected computers.
Licence :- Freeware
Homepage :- http://www.trendsecure.com/portal/en-US/tools/security_tools/hijackthis