Try this instead:
CLASS MACHINE
CATEGORY !!AUTORUN_DEFAULT
POLICY !!SET_AUTORUN_START
KEYNAME "SOFTWARE\Microsoft\Windows NT\CurrentVersion\IniFileMapping\Autorun.inf"
EXPLAIN !!AUTORUN_START_HELP
PART !!DISABLE CHECKBOX
VALUENAME ""
VALUEON "@SYS:DoesNotExist"
VALUEOFF ""
END PART
END POLICY
END CATEGORY
[Strings]
DISABLE="Disable Autorun.inf"
AUTORUN_DEFAULT="Autorun.inf"
SET_AUTORUN_START="Disable Autorun.inf"
AUTORUN_START_HELP="This will disable Autorun.inf"
-saige-