Process explorer - process explorer is a powerful tool developed by system internals which was later acquired by Microsoft and not it is known as the most powerful tool for windows trouble shooting. You can use it in time of virus attack when your task manger is disabled as virus generally have no control over it and thus you can easily shut down the process that the virus is running. It also contains many advance features which can be used by a user to look for the threads, files, memory consumption etc.