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Track file and registry changes made by software you are installing. Spybot Search and Destroy has registry monitoring capabilities. However, it is ideal to have an application watch and log every registry key modified in every hive by the software you are running or installing.Spyware, and backdoors are programs that have to be loaded into memory to be a threat. They often hide in the registry, under misleading names, and link to files hidden within the Windows system folders. It may be next to impossible to tell what is legitimate and what is a backdoor Trojan when looking though the registry and system files without knowing what was touch by that latest program you installed.You need the ability to revert to a registry state prior to a problem. This is useful in getting rid of spyware, as well as extending the free trial period on a lot of freeware software, which hides expiry data as disguised keys in the windows registry.