(http://www.nsauditor.com/freeware/image/regauditor.jpg)
Registry Auditor gives you a quick look at the Adware, malware and spyware installed on your computer including parasites and trojans. Registry Auditor tells you by colored icons ( green icon - safe, yellow icon - unknown, red icon - harmful ) whether specific Objects are known to be safe or harmful, also the program searches the registry for entries including filenames that aren't present on and allows you to delete unwanted registry entries. The tool is designed with a user-friendly interface and is easy to use.
Freeware
http://www.nsauditor.com/anti_adware_spyware_tools/registry_adware_spyware_scanner.html