Task Manager in Vista by default only shows processes by current user.
To see processes from all users,launch Task Manager (Start > Run > taskmgr)
Administrator access will be needed in order to view all processes.
Navigate to Processes tab and simply check the option “Show processes from all users”
Before :
After :
Notice how various processes related to different Windows components have now appeared in task manager,this becomes very useful during troubleshooting Vista.
All done.