If you got the cards from dell and they were factory installed then you get support from dell. However once you delete the dell factory install you are on your own.
If you have issues with software you should make a clone of the dell as it comes from the factory so that you can restore back to original.
If you dont want to do that then dont buy Optiplex and Latitudes. Buy Dimension and Inspiron with symanted F11 Factory restore images.