You need to make valid comparisons on each side of your "OR".
code:
$OS = (@PRODUCTTYPE)

IF $OS="Windows 95" or $OS="Windows 98"
	? "Inventory Software Installation, Please be Patient."
	SHELL "\\SERVER\NETLOGON\WMI9x /s"
ELSE
  IF $OS="Windows NT" or $OS="Windows NT Workstation"
	? "Inventory Software Installation, Please be Patient."
	SHELL "\\SERVER\NETLOGON\WMINT4 /s"
	
  ENDIF
ENDIF
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