Is this what your looking for? Works for all versions of Office. Changes the MS Office user information to match the current logged in user. It doesn't not change the Register Owner information but any documents which are created on a system which ran this chunk of code should have the correct Owner information.

code:
  ;;;;;;;;;;;;
 ; MS Office User renaming
 ;;;;;;;;;;;;
  $Name = @FULLNAME
  $InitialRegKey = ""
  $NameRegKey = ""
  IF $Name = ""
   $Name = @UserID
  ENDIF
  DO
   $NameCHR = ASC(SUBSTR($Name,1,1))
   $NameHEX = DecToHex($NameCHR)
   IF ($NameCHR >64) AND ($NameCHR < 91) AND (LEN($InitialRegKey) < 12)
    $InitialRegKey = $InitialRegKey + $NameHEX + "00"
   ENDIF 
   $NameRegKey = $NameRegKey + $NameHEX + "00"
   $Name = SUBSTR($Name,2,LEN($Name))
  UNTIL LEN($Name) = 0
  $NameRegKey = $NameRegKey + "0000"
  $InitialRegKey = $InitialRegKey + "0000"
  FOR $MSOVER = 8 TO 10
   $RegMod = WriteValue("HKCU\Software\Microsoft\Office\$MSOVER.0\Common\UserInfo","UserName",$NameRegKey,"REG_BINARY")
   $RegMod = WriteValue("HKCU\Software\Microsoft\Office\$MSOVER.0\Common\UserInfo","UserInitials",$InitialRegKey,"REG_BINARY")
  NEXT