HijackThis is a free heuristic tool for malware diagnostics and removal. The program scans the computer for keys with regard to processes, browser add-ons and settings, and startup items which are common breeding-grounds for malicious software.
The list it generates is irrespective of whether or not the entries are dangerous or not, so it’s not dependent on any kind of predetermined list of virii, giving a detailed look at what’s on the computer.
As with all such tools, it has its own tool for editing startup items and uninstalling programs. For simplicity of reading, you can also mark safe items for an ignore list so they don’t display on future scans.
HijackThis is an absolute must for diagnosing infection issues on Windows PCs.