Go into the device manager (Control Panel->System->hardware) & check that for the IDE/ATA controller that DMA is on for the LG. This is sometimes the problem.
Don't update the firmware for the burner, this can lose you your warranty if you screw up. And it's not likely to be the problem. Need to look at other things first.
Presumably the LG is the 4163B in which case the firmware will probably be A104. Get Nero's info tool if you've not got it( http://www.nero.com/eng/Info_Tools.html), this can tell you a lot, also CD/DVD Speed( http://www.cdspeed2000.com/ ), this can tell you about the media ID.