The Taskkill.exe program stops responding when you try to end a process in an installation of Windows Vista that is running in audit mode
Consider the following scenario. When you run Windows Vista in audit mode, you try to end a process by using the Taskkill.exe program. However, the Taskkill.exe program stops responding. If you try to end the unresponsive Taskkill.exe process by using another instance of Taskkill.exe, the second instance also stops responding.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB954072.