I want to buy a DVD Re-Writer for my computer. I've noticed that you can buy two different versions of the same drive - OEM or Retail? From what I can gather the OEM version comes with no software, manuals, drivers etc and the retail version is fully boxed with everything but is more pricey. Have I got this right as I dont have much experience installing drives on my PC and would rather pay the extra and have the instructions to hand when it starts to go wrong! Thanks in Advance.