From the developer:
"Fix your Registry and improve system performance with Registry Medic. The Windows Registry is a huge database that ensures normal computer operation. Installing and uninstalling software can make your Registry a mess, leading to decreased PC performance and causing computer crashes. Registry Medic uses an engine to scan your computer's Registry for invalid Registry entries.
"With the click of a button, you are able to repair or remove Registry entries that refer to a file or folder that has been moved or deleted. You can also scan and remove invalid software data and Start menu data from the Registry. Furthermore, this utility can kill Trojan viruses that use the Registry to spread and do damage to your PC."