The reason you are failing is that the USE command does not take a single string as input. USE requires separate in parameters (Drive, Path, Options (individual)).

See the following code sample: Code:
Function MapDrive($Drive, $Server, $Share)
	Dim $Drive, $Server, $Share, $shell
	Color c+/n

	If $Drive<>"" and $Server<>"" and $Share<>""
		$LogText="Connecting $Drive to \\$Server\$Share"
		? $LogText
		USE $Drive /Delete /Persistent
		USE $Drive "\\$Server\$Share"
		If @error=0
			color g+/n
			$x=" - Success"
			"$x"
			If val($DOS) >= 5
				$shell=createobject("shell.application")
				$shell.namespace($Drive+"\").self.name=$Share + " on '" + $Server + "'"
				$shell = 0
			Endif
		Else
			color r+/n
			$x=" - Failed: Error @error"
			"$x"
			$ErrorState=1
		Endif
		WriteLog ($LogText + $x)
		WriteLog2("%temp%\MapDrive.log",$LogText + $x,1)
		Color w+/n
	Else
		WriteLog ("Function 'MapDrive' called with invalid parameters: '$Drive', '$Server', '$Share'")
	Endif
Endfunction
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