Process Explorer

Ever wondered which program has a particular file or directory open? Now you can find out. Process Explorer shows you information about which handles and DLLs processes have opened or loaded.
I am a computer technician and I used to kill virus process was Process Explorer. It gives you an option to see the processes that are running in your computer in tree view. You can always have time to kill the process even if your task manager got infected by virus or any other infectious files or programs.

Now try it for yourself how useful it would be for you. Download it here.