Incorrect syntax
code:
IF @PRODUCTTYPE = "Windows 2000 Professional" OR @PRODUCTTYPE = "Windows XP Professional"
  GOTO INST
ELSE
  ? "This workstation is not Windows 2000 Professional or Windows XP Professional"
  EXIT
ENDIF
Also, look at the OSID() UDF and never use GOTO. It's not even necessary in your case.
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There are two types of vessels, submarines and targets.