Process Revealer

Process Revealer is a hidden-process detector that reveals running
programs which do not always appear in standard detection utilities. It
features detailed information about each running process, highlights
hidden programs, kills hidden processes with one click, and more. Many
utilities that give information about running processes, like the Windows
Task Manager, can be fooled into not displaying information about hidden
processes. This can be exploited by spyware and trojan writers to
infiltrate your computer without being seen. Process Revealer displays all
running processes, including the hidden ones, and gives sufficient
information for the user to close down any suspect processes, or close down
and then automatically delete the file so they cannot run again. While
the interface is not pretty, and sometimes the information supplied is
minimal, Process Revealer is still a "must have" utility to ensure that
your computer is not being hijacked under your nose.
Free Software available here...