Using either one of these will do to make the Task Manager work once again. If Task Manager has been disabled or damaged, it should be easy to choose from either one of the following tweaks. The tweaks below were only tested on XP. They might work on Vista.

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Resetting Task Manager
Copy the following in to Notepad:

Code:

Windows Registry Editor Version 5.00

[-HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\TaskManager]


Click File > Save as
Choose Save as type: All Files
Save the file to your Desktop as resetTask.reg
Exit Notepad and double click on the file to run it. Choose Yes/Confirm any prompts.

Please reboot for changes to take effect.

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Re-enabling Task Manager
Copy the following in to Notepad:

Code:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
"DisableTaskMgr"=dword:00000000

Click File > Save as
Choose Save as type: All Files
Save the file to your Desktop as enableTask.reg
Exit Notepad and double click on the file to run it. Choose Yes/Confirm any prompts.

Please reboot for changes to take effect.