Auslogics Task Manager shows how much CPU, RAM, Disk Usage or Internet bandwidth is used by the processes running on your computer. The program will also show you the services and open files; you will be able to see which programs keep which files open. It can also help you to find trojans hiding in legitimate processes, such as explorer.exe.

Sidebar Gadget is a Vista sidebar tool that provides detailed information about the most resource-heavy processes running on your computer. It displays how much CPU and RAM each process (e.g. lsass.exe) uses. You can view a detailed process description by clicking on the magnifying glass sign. You can change the number of processes you want displayed, processes update frequency, and customize the gadget from the Settings window.