How to write to the disk when the (Windows XP) user is restricted?

I need to write to an INI file as well as storing temporary files on the user's disk while running my program. How do I find the user's root directory where he/she is authorized to write if he/she is a so called restricted user?
haabAsked:
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sftwengCommented:
function DefaultSaveLocation: string;
var
  P: PChar;
begin
  {
    returns the location of 'My Documents' if it exists, otherwise it returns
    the current directory.
  }
  P := nil;
  try
    P := AllocMem(MAX_PATH);
    if SHGetFolderPath(0, CSIDL_PERSONAL, 0, 0, P) = S_OK then
      Result := P
    else
      Result := GetCurrentDir;
  finally
    FreeMem(P);
  end;
end;
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sftwengCommented:
BTW, you'll need "uses SHFolder".
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sftwengCommented:
This is code taken from creating a new project:

File -> New -> Other -> Projects -> Win 2000 Logo Application
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