How to repair and restore task manager?

I have had many PC's come to the shop with task manager disabled.
To the skilled user this is frustrating and is often caused by malware, virus or simply, user error. Have no fear the fix is here!

Here's How:

1. Click Start
2. Click Run
3. Type REGEDIT
4. Click OK The Registry Editor will now open
5. Browse to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Policies\system
6. In the right pane, look for the value: DisableTaskMgr
7. Right click DisableTaskMgr and select Delete. (When prompted with "Are you sure you want to delete this value", select Yes.
8. Now browse to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\policies\system
9. In the right pane, look for the value: DisableTaskMgr
10. Right click DisableTaskMgr and select Delete. (When prompted with "Are you sure you want to delete this value", select Yes.
11. Close the Registry by choosing File | Exit
12. You should now be able to access Task Manager. If not, reboot into Safe Mode and repeat the steps outlined above.