Once again... such a driver DOES NOT EXIST.
The writer must be recognized automatically through standard windows driver. You didn't need a driver for your DVD-ROM, right?
Check the jumper setting of your DVD-ROM and writer: best thing is to set the writer as MASTER and the DVD-ROM as SLAVE. This should fix your problem.
Another hint, maybe a stupid question: are you sure that power is connected to your LG writer? Do you see some led flashing when you power on the PC?
Hope this helps,