corrupt or missing \windows\system32\config\system

My friend has been using Win XP home which was loaded for her by someone now untaceable.She has been using it for seveal months.
When she starts up her computer now all she gets is the following error message:-
Windows could not start because the following file is missing or corrupt\windows\system32\config\system.You can attempt repair by using the original set up CD ROM select 'r' at first screen.
The problem she has is that she doesn't have the original XP disc nor did she ever create a boot disc when the o/s was loaded.
She has bought an OEM XP Home disc in an attempt to get round this but all she gets is the same message.
Can anyone please advise
Many thanx Pootie

  ©®@$? 16:25 30 Dec 03

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