I'd not use computersystemproduct... but use systemenclosure instead.

This is what I use for hardware detection for my collection of Dell laptops and compaq desktops.

code:
:Hardware
	$CPUsp	=@mhz
	$Memory	=Memorysize(0) +1
	$Modem	=WMIQuery("Description","Win32_POTSModem")
	$HD	=WMIQuery("Size","Win32_DiskDrive")
	$hdGB	=left($hd,len($hd)-9)
	$Make	=WMIQuery("Manufacturer","Win32_ComputerSystem")
	$Model	=WMIQuery("Model","Win32_ComputerSystem")
	$Biosv	=WMIQuery("SMBIOSBIOSVersion","Win32_BIOS")
	$biosd	=WMIQuery("Version","Win32_BIOS")
	$asset	=WMIQuery("SMBIOSAssetTag","Win32_SystemEnclosure")
		if instr($asset,"|")
			for each $return in split($asset,"|")
				if $return	$asset=$return		endif
				next
			endif
	$SerNo	=WMIQuery("SerialNumber","Win32_BIOS")
	if len($SerNo) < 2 	
		$SerNo=WMIQuery("SerialNumber","Win32_SystemEnclosure")
		if instr($serno,"|")
			for each $return in split($serno,"|")
				if len($return)<10	$serno=$return		endif
				next
			endif
		endif
	select
		case instr("$model","deskpro")	$case="Desktop"	
		case instr("$model","evo")	$case="Desktop"
		case instr("$model","latitude")	$case="Laptop"	
		case 1				$case="Not Specified"
		endselect

	? color c+/n "	Computer Model:	" color w+/n "$Make $Model $case" color w/n
	? color w/n  "			" color w+/n trim(@CPU)" / $memory MB / $hdGB GB" color w/n
	? color c+/n "	Serial Number:	" color w+/n $SerNo color c+/n"	AHCATag:  " color w+/n $asset color w/n
as for the errors, it is probably a typo.. can't tell without knowing the code or exact error
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