How to open HKLM\SYSTEM

Hello,i have a problem i want to change CSDVersion registry key to Windows XP SP2:
HKLM\SYSTEM\CurrentControlSet\Control\Windows\CSDVersion value=200
how i can do that plz help me
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More about open hklm system
  1. plz i need an answer
  2. Use regedit. (Open a command prompt as Administrator and type "regedit").

    If you don't know how to do this are you sure that you should be messing with the registry? It's a great way to completely hose your Windows installation if you are not fully aware of what you are doing. I'd recommend against following someone else's instructions parrot fashion where registry keys are concerned.

    But - do you feel lucky?
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