[Peter_]

As the others say above just be careful and ensure that you have the drivers available for your network card, or does your machine have have a partition or come with backup disks to reinstall your O/S.

Because we quite often get calls from people that have formatted their machines and wiped all the drivers from the hard drive and call in thinking it is our fault until we show them that the network card icon has disappeared and we then refer you to the vendor.