It is virtually impossible to keep an overview of all the system changes of a computer system. Windows does not offer a way to keep track of the changes that are made by applications, updates and the operating system and even if there was a way it would provide the user with a long list [...]
Monitor your PC with WinPatrol
What happens if your antivirus or antispyware software does not detect a malicious application ? One of the things that will most likely happen is that the malicious application will add itself to the system startup most likely in the registry to make sure it is always executed when the system starts.

