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Please remember that most Dell systems come with some specialised hardware drivers for some odd hardware they picked up somewhere, and you may not be able to get them from somewhere else. Also, the older Dells had a partition to rebuild the system from, while most of the modern Dells require you to make a rebuild CD or you don't get one at all. The rebuild CD will usually reload all the trial software as well, so a rebuild from it often puts you back where you started from; this is because it's usually an image of the system as it shipped from the factory.Another thing to remember is that the version of Windows you get on most Dells is NOT the full Windows, but a version trimmed just for their system. If you wish to load the another version of Windows or some other operating system that you have a legal copy of, then the best option is to reformat the drive and load the new copy and not the original. But please make your back up copies first, and please check to make sure you have all the suitable drivers you need as well.