This information is stored in the registry and can be retrieved using the RegRead() function. Here's a quick way to read this info from the registry and display it in message boxes.
#RequireAdmin
#include <MsgBoxConstants.au3>
Local $manufacturer = RegRead("HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\BIOS", "SystemManufacturer")
Local $model = RegRead("HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\BIOS", "SystemProductName")
MsgBox($MB_SYSTEMMODAL, "", "Manufacturer: " & $manufacturer)
MsgBox($MB_SYSTEMMODAL, "", "Model: " & $model)